Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d81542bb39cf344…

MALICIOUS

PDF

157.7 KB Created: 2021-02-19 13:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 932200d81f024bc9967f5d7333150581 SHA-1: 218cf8922e9ac57f650b939ca061810c1ef2e2f2 SHA-256: 4d81542bb39cf34483df21a08e00e5f1ef12d1b2089da3c96a5d03ffd1256839
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing phishing pages or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. The presence of urgency language further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/123?utm_term=what+state+is+known+for+human+trafficking PDF link annotation
    • http://rabatil.22web.org/modes_of_documentary_nichols.pdfIn PDF document text
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/7245392.pdfIn PDF document text
    • http://sokolov.fun/98158974939cxch8.pdfIn PDF document text
    • http://kukushpa.fun/25843167440p0fw8.pdfIn PDF document text
    • http://sidazolomaw.22web.org/comrade_in_america_movie_free.pdfIn PDF document text
    • http://ultra0.space/lijukugtnqy9.pdfIn PDF document text
    • http://tehnikator.ru/82172472747v1xqt.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/hcwjeOJ/xotiwewiv.pdfIn PDF document text
    • http://podjem2.club/mass_communication_living_in_a_media_world_7th_editionhditp.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/jeieroq/uefa_europa_league_winners_prize_money.pdfIn PDF document text
    • http://hamsterbig.com/boxejemewekire15vn9.pdfIn PDF document text
    • http://meblik.su/nuvonu0c2zi.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/ehcgjih/private_vpn_app_store.pdfIn PDF document text
    • https://rukukodobaxifa.weebly.com/uploads/1/3/0/7/130740191/bulafanuk.pdfIn PDF document text
    • https://kavikazu.weebly.com/uploads/1/3/5/3/135392310/wigunororav.pdfIn PDF document text
    • http://conicppjry.bid/apache_160_piceb12l.pdfIn PDF document text
    • http://merovew.xyz/kuwobenebewugajikutemezebhry8l.pdfIn PDF document text
    • http://ketotreno.buzz/ver_kung_fu_sionhnxmh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zopefunexot.epizy.com/ecppt_report_template.pdfIn PDF document text
    • http://daxevekiwenux.epizy.com/pozasafutevusof.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_off00022c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C04 5432 bytes
SHA-256: 476e4d91e15681418b74c09cd21ba2acbcb608512b4784e7f6533ab9b561e41d
font_01_sfnt_off00023e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E76 12952 bytes
SHA-256: 2f88afe18c145a9d3198abb15e8b68ae0dcd4e5c3e3e8196235ffe0fada140c8

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