Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f4ba7561124ef7…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 12:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2ecc8d2ab6a47a058dfa72b646e7adbf SHA-1: f968da5457ed0a0fb2719b970f7a5c7297f528f5 SHA-256: d3f4ba7561124ef73afbd08dd0b97f205b92423324ecba1739a2a5fc9a1b7094
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 0.9998

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://leonvi.ru/123?utm_term=how+many+calories+in+a+small+sonic+slush PDF link annotation
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/fetalanim.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ifqvge8/knives_out_house_interior.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/e7694289a325c.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/vovejekemirij-fopaz.pdfIn PDF document text
    • https://panebafizi.weebly.com/uploads/1/3/4/3/134365464/4642053.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/hdjWA8w/free_woodworking_plans_for_outdoor_furniture.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ndVbQjj/50221937683.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/a02ghZC/cake_decorating_supplies.pdfIn PDF document text
    • https://texexavif.weebly.com/uploads/1/3/1/4/131454683/b12d16a81e9577b.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/ZxZP7jg/business_international_group_poznan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanisoz.epizy.com/diverticulitis_treatment_guidelines_2019.pdfIn PDF document text
    • http://vitipazapabixu.epizy.com/boney_m_songs_free_320kbps.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/kesumox.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/demov.pdfIn PDF document text
    • http://parisexubuvi.rf.gd/92034016991.pdfIn PDF document text
    • http://loxeputogojew.rf.gd/mott_s_applesauce_cups_nutrition_information.pdfIn PDF document text
    • http://xufutat.epizy.com/81508570552.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_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 5192 bytes
SHA-256: 6bf0f3054cd9321477730c005f8f47fa2cda3da8715242be0729a5fbc8f1cabd
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 10796 bytes
SHA-256: a75f818d57f84977e39a5b191bd160b63d80bb1552aa047cdfa0ab354139783a

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