Malicious PDF — malware analysis report

Static analysis result for SHA-256 be73287c8ae78958…

MALICIOUS

PDF

73.6 KB Created: 2021-06-08 20:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca9208d38b815c4421f522fe552631e0 SHA-1: 99a652db776134a6f4ed6089e32bff786cac5f6c SHA-256: be73287c8ae789585ef975190209cc983a3e1009d95bdd08d62c5fd281ae6da1
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 0.9995

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://medvor.ru/pbw?utm_term=asur+torrent+download PDF link annotation
    • https://kerimoseb.weebly.com/uploads/1/3/5/2/135299904/vajodikekebise-disol-mugigixuvo.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/podatetilubuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460680/normal_5ff9df55b47a7.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/9dba0b47d8374.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/84e06a4065.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6001008686954.pdfIn PDF document text
    • https://gikijeza.weebly.com/uploads/1/3/4/4/134465371/67019eef81af8.pdfIn PDF document text
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/jateji.pdfIn PDF document text
    • https://xobazebesefegox.weebly.com/uploads/1/3/5/3/135321136/bunugelufidivi.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/vavuboj-pexisewobilo-foveke.pdfIn PDF document text
    • https://dodaxopaz.weebly.com/uploads/1/3/4/8/134865523/genidojazulofe.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/f320df17-5480-4a77-bcc4-a703101dc734/kisigedumelabufawikagi.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/mopeduwinireloseze.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/ninjago_masters_of_spinjitzu_season_13_episode_7.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144681624/81743363416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e71f574-e1ce-4457-a5a7-98ca355f8aaa/shape_and_color_activities_for_preschoolers.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/average_high_temperature_in_los_angeles_in_january.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2f1a79-5b07-4e30-8cd7-5ef2a1e4f5b7/is_breville_microwave_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/920d7d13-30ec-4056-9cb2-1439bfc64744/vufipejoxifeluribilomuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8142cf-cef6-46eb-8281-33cc360c37fb/how_to_program_automate_am6_remote_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8442c4ed-5372-4098-87e3-f7aa8e59b104/49711669515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9da85040-5e71-4d31-8b58-e61672ac16f0/the_mysteries_of_udolpho_themes.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144592239/t-mobile_personal_cellspot_4g_lte_signal_booster_review.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_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 4900 bytes
SHA-256: 84cabc660df6439653b83de097c0a3ff5e7530f25e3d7777c3ac04fa6fbcfae8
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 10340 bytes
SHA-256: f495d6c1d16616fde8a7c9e66b111a00f45ba1977215494f1beac6330e21ce54