Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cb1ef15f40f7db…

MALICIOUS

PDF

78.8 KB Created: 2021-02-18 22:30:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b5c1543073fbe160490a066e68c3e49 SHA-1: 50b3e2a5c625f3af98531666d6bbe0b00963a440 SHA-256: c7cb1ef15f40f7db46846cf191125c37091a1d1f1a02cdfd1e56d3a489fc20d1
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=birthday+book+astrology+october+12 In PDF document text
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/1afeeeb152df.pdfIn PDF document text
    • http://hiziryigit.online/97303400870g30t4.pdfIn PDF document text
    • https://torewofatovamek.weebly.com/uploads/1/3/4/1/134108613/01d15c447398a.pdfIn PDF document text
    • http://duxuzibeb.22web.org/vorovumipominetimadamup.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/gozetelut.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/giXibqK/road_rage_meaning_in_arabic.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/9ce9e059103b.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/pNicnSy/jigobesore.pdfIn PDF document text
    • http://bebosebe.66ghz.com/74371623130.pdfIn PDF document text
    • http://sodahub.pro/stoker_2013_movieol3j8.pdfIn PDF document text
    • http://sberin.xyz/emergency_dental_care_usa_roseville_mna2n3p.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/uGjhgha/37921050083.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/31iboxr/completed_business_plan_examples_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/jupuvonijor/hbjcfge/sebitamu.pdfIn PDF document text
    • http://sportita.fun/oppo_103_manualya24h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://darajakejaxise.rf.gd/avatar_game_mod_apk_free.pdfIn PDF document text
    • http://mevonaku.rf.gd/furakalujiwolobuwilivo.pdfIn PDF document text
    • http://ludatijodibop.rf.gd/job_application_letter_example.pdfIn PDF document text
    • http://bosurigazo.epizy.com/rexovuvozakigenogabeg.pdfIn PDF document text
    • http://sinubazafapeni.rf.gd/robinair_vacuum_pump_spare_parts.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_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 5740 bytes
SHA-256: e287badd9cf701f8eee9474fc7ff274821c577c8639a7fc3da562f795900abba
font_01_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 11148 bytes
SHA-256: 56b6bedeafac703adb1537cc3970785d784cfce01d708c13b84eb4253aa08a46

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