Malicious PDF — malware analysis report

Static analysis result for SHA-256 84137c3b3a3a1265…

MALICIOUS

PDF

79.7 KB Created: 2021-03-02 16:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7a3e95457cbd5eaf20ac9f1dc7f91ef6 SHA-1: 12e77aa21abe7bcd2f4957d5f32f90bf9e51a5d6 SHA-256: 84137c3b3a3a12650b94f409ed33846c3edf16bb658202b64e064434f5c21eeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://kuzutuzo.ru/123?utm_term=minister%2527s+black+veil+analysis PDF link annotation
    • http://xasumemazekejo.scienceontheweb.net/america_is_not_the_greatest_country_in_the_world_anymore_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_600c74e05b351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fee402dcc009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_603063f4320a3.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_to_get_certified_insurance_agent.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_5ff7a8f5a6f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fe6bf487678f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_6015594a23d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_5fd2c9d3e83ca.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/10979432001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fc88f43d9e26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454561/normal_6008857113862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375504/normal_5fda5f8b1811d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467560/normal_6017595986ebc.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/35870348693.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/kofadelo.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/ba_ii_plus_financial_calculator_emulator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likewiwojuxus.atwebpages.com/zoboboxa.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/cuanto_es_50_gr_en_tazas.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_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 5200 bytes
SHA-256: d78eafe37995a090dfe23b66e5425f6d188ce299a821d0f307e352517177e116
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 10604 bytes
SHA-256: 4db3eef0805931b04001fe57146c77d4dd12d43ce07888813e408f62a8c59509