Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8dfe67d6f6b421…

MALICIOUS

PDF

71.6 KB Created: 2021-02-26 18:17:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4109653229bf049c65b43e87eff11d84 SHA-1: d8f4eb355fb4b2d9c01c1ec996b969c863d7dd0e SHA-256: 3f8dfe67d6f6b421222f735c1f3606ec8e1d7f42205bb2ddc68e83e60b94bce1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://zajinet.ru/strik?utm_term=bob+evans+omelette+nutrition+information PDF link annotation
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/kulekiwojosa-tozubepefa.pdfIn PDF document text
    • http://callipakk2.site/lelevovibimest072.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/xjhd7pP/20188278192.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/6059735.pdfIn PDF document text
    • http://womenita.fun/analysis_report_introductiong8hu1.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/vhfToic/piano_tiles_mod_apk.pdfIn PDF document text
    • http://yoga-italy.space/resident_evil_6_o_capitulo_final_trailerpfl3v.pdfIn PDF document text
    • http://okstore.info/what_do_you_mean_by_information_technology_industryluj65.pdfIn PDF document text
    • https://cdn.sqhk.co/jenuluvonuz/eBSohce/dedazonitugekudewivas.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/turigiviweben_pepuvirevivozej.pdfIn PDF document text
    • https://nebumokijisuj.weebly.com/uploads/1/3/5/3/135326708/3ad6fbf84f09.pdfIn PDF document text
    • http://verifybadgehelp.com/79531340846qs5ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_601ab175337ad.pdfIn PDF document text
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/kopawuvaxusozabexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413978/normal_5fcbf88eab203.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/fiaiaoM/fevaferisuxazukuzejidizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5fe8b21714772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/26904880442.pdfIn PDF document text
    • http://gojaxuga.epizy.com/bonafide_certificate_for_school.pdfIn PDF document text
    • http://majoxokusixapav.epizy.com/8040951270.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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 5164 bytes
SHA-256: bda1acce9907efb40e020bbfba04dd763615acae3cab607342919766d202d3f6
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10320 bytes
SHA-256: 0e597324fad3674f3761b3aea8908c63d0d73ec38840cbba59a4225629760573

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