Malicious PDF — malware analysis report

Static analysis result for SHA-256 6739139f4db18d98…

MALICIOUS

PDF

69.1 KB Created: 2021-01-10 17:24:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: edcb0dd0977bac032d9d55558fc4df0e SHA-1: 75f92d59adcc65c3ba37f158965e2b330143dc68 SHA-256: 6739139f4db18d98392ff0362d2ae9654b3935707a53909095275ae8c51403ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=buena+vista+library+co PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448727/normal_5fbfdf3e5fded.pdfIn PDF document text
    • https://site-1183794.mozfiles.com/files/1183794/beast_quest_series_13.pdfIn PDF document text
    • https://kabijibijeg.weebly.com/uploads/1/3/4/9/134900291/nuxonab.pdfIn PDF document text
    • https://site-1175575.mozfiles.com/files/1175575/53462311327.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/foviz.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/fofaf_fepimupi_ziguxek.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/war_of_the_worlds_fox_2020_cast.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/2813360882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5fce8d9129104.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/divuwixudibar.pdfIn PDF document text
    • https://niwurakoj.weebly.com/uploads/1/3/4/5/134588258/4fb7cbc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fef77176b77c.pdfIn PDF document text
    • https://site-1176203.mozfiles.com/files/1176203/94469818992.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/f7cd64dc8b.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/rojalexipokadaz/bts_bulletproof_pt_2_song.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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 5144 bytes
SHA-256: 5fbaf2f405b1a2a56f805e563e6c0a880ad9c9389a2494fb439a74f0449410fa
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10432 bytes
SHA-256: 32de1332b2db12145ea88b4cbd7e296a90113a707a2f08cd77f8f40f0214d929

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