Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7799cf9d79f3ad…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 00:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 179429a3ba321bd3d8b8707251792068 SHA-1: be0b349d9514b248c009032c2b42e2750f2f11ff SHA-256: 3e7799cf9d79f3ad2e22d39d4707a59fdd2f895b86a91e9f8af4994696af48f4
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 0.9996

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://lozipotod.ru/strik?utm_term=recommendation+letter+for+assistant+professor+position+pdf PDF link annotation
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/819060.pdfIn PDF document text
    • http://mazafaka69pussy.online/what_is_enthalpy_change_of_neutralizationjojf4.pdfIn PDF document text
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/e21ec09d8422.pdfIn PDF document text
    • https://xajavixakopus.weebly.com/uploads/1/3/4/8/134898113/zibel.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/4e19e732.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/vonejin.pdfIn PDF document text
    • https://natemavobu.weebly.com/uploads/1/3/4/3/134349428/5036625.pdfIn PDF document text
    • http://helen-art.ru/keurig_2.0_needle_cleaning_podsb1pj.pdfIn PDF document text
    • https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/d4acb8e.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/5746c98416f.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/c124d6d88493f.pdfIn PDF document text
    • http://mebelrostov.ru/coin_dozer_casino_free_gemsdh6qc.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/de323bc17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukofov.epizy.com/bapum.pdfIn PDF document text
    • http://mipuvofelope.epizy.com/65903415466.pdfIn PDF document text
    • http://barovupaxar.epizy.com/16512802.pdfIn PDF document text
    • http://noximizifurel.epizy.com/expositors_bible_commentary_download.pdfIn PDF document text
    • http://dumevurofif.rf.gd/lofebabivavadomogofuja.pdfIn PDF document text
    • http://womutevu.rf.gd/finanevusulamis.pdfIn PDF document text
    • http://sepinolet.epizy.com/if_you_park_downhill_in_a_vehicle_with_a_manual_transmission.pdfIn PDF document text
    • http://robogotut.epizy.com/health_promotion_officer_interview_questions_and_answers.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 5308 bytes
SHA-256: ffc79d445c4a124b7f633eff8611c6c2a0ff9d5f968823d38c787e3f5a307d14
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 10484 bytes
SHA-256: 7386954c848fa923c351defa7c6e8e23198a9261c6aa3ea8929023fb45793a00

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