Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf83a053dec6077…

MALICIOUS

PDF

116.1 KB Created: 2021-05-13 17:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4dbdeaccbfbeeae4cc8afad70f996e17 SHA-1: a4fb5ddd474d6792f9aa38288d873be4cdf2b300 SHA-256: 8bf83a053dec6077d4ec0aa647e1a49ce0bea2c6528cea9490f80b6d74c1d6fd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary external links points to a PDF hosted on 'simisasokudu.weebly.com', which is part of a larger link farm detected by heuristics. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lozipotod.ru/strik?utm_term=en+quoi+le+voyageur+contemplant+une+mer+de+nuages+est+romantique PDF link annotation
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/42c523ddd.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/jvOxhcO/xejobozebame.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/GZibSjg/under_seat_storage_for_toyota_tundra_crewmax.pdfIn PDF document text
    • https://sizadefo.weebly.com/uploads/1/3/4/3/134381744/1544625.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/bEjbnjc/pevopagebadodimebalaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/AIqghgf/hoop_messenger_channels_philippines.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/jujasimofitune.pdfIn PDF document text
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/d14b55742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef264492-a53b-4050-b246-f5466e419b6d/jokitelafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e9d769c-5916-482f-8545-f865985bb140/vuneramevukedilerokejif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ac49d4-c0ee-4ca1-aa12-2af0a6636d24/what_is_some_figurative_language_in_a_poem.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_81f6ea55669f43929056247ea504adc8.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_c0017ca200fc4f108ac0f40c33cbd86b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c89211-e3cf-4793-8f3d-ba3ecc0a34f3/m_butterfly_play_audio.pdfIn PDF document text
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_c967946640ee423f845a48f7dec98e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a801326c-d9ec-4970-9476-18dd650bcefb/23047690721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fab730f-9d67-4c5c-bfac-c747ab0e2a5f/grunch_of_giants_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932cc730-897d-4c90-9dea-4f5c2647c142/77410644692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ae2c38f-ef3f-4e07-b3d0-948ddef7cef1/gobefapakusez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdb998b-d6e8-4c33-a3d3-4224a45b1d3f/timisaziladixoxewasufosu.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_ce953f3bf4e5429496dff8d9790eb00b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b4d999-de3b-4251-bf43-22ef41dac301/word_2016_keyboard_shortcuts_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fd63b56-77b2-4188-b4df-21a035aa8d75/kenmore_elite_refrigerator_model_795.pdfIn PDF document text
    • https://93bb5028-8b17-4c47-8ab9-f46a024b0e86.filesusr.com/ugd/041612_59f90b1fb0a4400fbf1959e8d66bcd9c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15141 4312 bytes
SHA-256: 0b233b0a883e66b5fae195a499c01126a36a15023309cb2594163c48b1762838
font_01_sfnt_off0001608c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608C 5640 bytes
SHA-256: b1b4a9e0eeb28d50f9c7de5e9c1cfb7d829c1965447652dc7f9426179eb933b0
font_02_sfnt_off000173b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173B7 18188 bytes
SHA-256: 8b676fd998bf5bea6c483e22179dcd3e90bcf7c7884db83ed4de7f44ca019fdf
font_03_sfnt_off0001aa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA60 16136 bytes
SHA-256: ade83d52e3783374d563f8e3f611c44885fd60ce8da9bf293457df8a18c1cb14