Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcf361266e8b0d8…

MALICIOUS

PDF

85.1 KB Created: 2021-05-23 17:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 26162225eaeee7f2276456a196747fa4 SHA-1: 737042462b41977b76391c84a4250f3576fdbb83 SHA-256: 1dcf361266e8b0d82e14649d5f9dd93f698b91e6009d02f05748df9640355879
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=8+queen+problem+using+backtracking+step+by+step PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5fe34fc5a6c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_602e986c86300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_6054e5b42cbbe.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/a4fe901780fb32.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/74e9538f9b3d69.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/3066986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_5fd89b63237d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6052cc66784c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_605f2d734b561.pdfIn PDF document text
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/fc8a7c8b.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/53ca98aad6e8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_60394fa945199.pdfIn PDF document text
    • https://niregesop.weebly.com/uploads/1/3/0/7/130776037/milenu_dupasojug_kuzarowakoze.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/6e56f3d1-2f64-4842-a722-dec9f3a99b0d/degibivazowuzipe.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/minosajesufizakolo.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/autodesk_inventor_2019_3d_printing.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/77974488536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccba37b3-1daa-4a35-bd1f-4c39c6ad627c/18077903304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4a9c74-16e2-4d65-8fbc-6d295a999aee/vutisoxuripitogotizija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e755eb22-8fbd-43a1-9af2-5e48290e6be7/21_day_sugar_detox_yes_no_list_level_1.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/break_even_point_formel_deckungsbeitrag.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/deep_sleep_guided_meditation_michael_sealey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b57c3b-ccf0-49d3-a4ab-eb855a82732d/34160525241.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 5784 bytes
SHA-256: e09f92b0f82932cc6f3a4df2ee7bb1bd3bee7f1bd98c5d8e79cb5267c224c91a
font_01_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 11928 bytes
SHA-256: 572026ddf60fb85072699e188440373e27ad4c1a0d4e7d64c645a7a86c6280da