Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfedf92e1fdf6385…

MALICIOUS

PDF

74.5 KB Created: 2021-02-07 03:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2464c3c939960b7ce1fccfd488de9c53 SHA-1: 815e258bce1ba2e0a679880cf7f6c5d640daf307 SHA-256: bfedf92e1fdf63854db56aa7daf068c7f2cc3ed7a9c13bb1fbeace7f5e9d84c7
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://jacksth.ru/123?utm_term=axumin+vs+c11+choline PDF link annotation
    • https://jifafaxima.weebly.com/uploads/1/3/1/8/131871415/a3680d958230.pdfIn PDF document text
    • http://cyberghost.store/betrayal_of_trust_nollywood_moviel9ogs.pdfIn PDF document text
    • http://matteset-spon.space/agricultural_marketing_channelsn1xh0.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/6923680.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/hdcUPhf/waradapiwapejexerekagu.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/bKTmBt3/fonivosubujunixape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_6008d76fd03e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_601ca5f3ca31b.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/hcheogi/boston_landing_commuter_rail_zone.pdfIn PDF document text
    • https://zirowebepalijiw.weebly.com/uploads/1/3/3/9/133986526/8bd919ea45e40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494668/normal_5ffce48748329.pdfIn PDF document text
    • http://hookup153.fun/format_of_report_writing_in_english_cbse3bzsu.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/ghd0ghN/five_nights_at_freddy_s_song_4.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/pofugut.pdfIn PDF document text
    • http://bestita.space/watson_theory_of_caring8hwtn.pdfIn PDF document text
    • http://domavera.ru/dagobusarevetebirwv3hn.pdfIn PDF document text
    • http://ohota-ribalka.online/globe_at_home_username_and_password_huawei8xg8l.pdfIn PDF document text
    • http://tells.fun/reference_angles_in_radians_worksheet8hhpn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 4904 bytes
SHA-256: 76ea219c3a8d2b28611049817cd24f97cd824e8de881727e7a77d2033944cbc6
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 10872 bytes
SHA-256: 17b9a2b4c7f911968147e88577d2ec4f881cbaed677edda61a3bce08f2f6c99c