Malicious PDF — malware analysis report

Static analysis result for SHA-256 986f88fe22d115f4…

MALICIOUS

PDF

94.6 KB Created: 2021-03-31 22:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 88a84e9e181b21d25012890adb7999b9 SHA-1: 3fd3f7323d1cca16673d361d1e628277f6bc4f2d SHA-256: 986f88fe22d115f41325daaf5e9e2985ffe93c3992421cdbb66bae9d95199224
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 0.9967

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://resalured.ru/123?utm_term=advantages+of+public+transport+academic+reading+answers PDF link annotation
    • http://terem.space/31960597434zie87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_603d567d171c0.pdfIn PDF document text
    • https://jekewuvewaw.weebly.com/uploads/1/3/1/0/131070420/temilowujoxo.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/4760699.pdfIn PDF document text
    • http://copyright-central-media.com/piriformis_syndrome_how_to_sitgbblh.pdfIn PDF document text
    • https://sizonijuza.weebly.com/uploads/1/3/4/5/134594560/balofotuxavugopuxi.pdfIn PDF document text
    • https://wavujosivisero.weebly.com/uploads/1/3/2/7/132740585/xifidisuvezi-rodizageloliv-sizobunukofulo-wofil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fee1e49a9cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_603a893aa9cd9.pdfIn PDF document text
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/rofef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_603167da7bff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_6044781ade582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fibesezati/puwupoleda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca865cb-519f-44a5-a3ba-895a802aa89f/what_do_you_write_in_a_self_evaluation_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982ddac6-4a92-40bd-afed-bfbb47cb1eef/muwixugon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe84ebf5-7f0b-42f4-89af-406431fd9121/saxadojaben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26b1c45-76ad-40e0-9cb5-cd559cca6001/dexefewaxog.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/mod_hack_game_android_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46a2b8b-efcc-4d7e-bf78-31284f165897/apex_digital_tv_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/palo_alto_3220_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/peter_and_wendy_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e1a9e5-eb76-496c-aac2-3d502a75c07b/jesus_camina_sobre_las_aguas_biblia_latinoamericana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e5a9a7-04b1-44bd-894b-cd4d15c931ba/keboxademo.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/invictus_poem_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22a18e7-1cc5-473e-b445-51dc565d4ca7/how_to_start_a_introduction_paragraph_for_an_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff97d62-df47-4b72-8c5c-c6de1ff3e896/rulubizegesizelodower.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_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 5756 bytes
SHA-256: 3c6fa3d2c3b9e2e479e1239f660553e9e1d37c189f83d3cc6d8e1560e812755e
font_01_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 11188 bytes
SHA-256: 07b27406be7852fae3d8ed0380e852a1d49583f4cd3d04037bb9a22b42188572