Malicious PDF — malware analysis report

Static analysis result for SHA-256 2588d1287d07b764…

MALICIOUS

PDF

77.5 KB Created: 2021-02-12 22:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c515a147d864279da07f5a6a00b9365e SHA-1: c6b9d4d13cb475dba3ba5795b57b99ca623f374b SHA-256: 2588d1287d07b764d9cc7a6ec3610df6efea1e796bc72f01500461c670a4286e
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 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://seumenha.ru/123?utm_term=gastroenteritis+guidelines+rch PDF link annotation
    • https://jaloteke.weebly.com/uploads/1/3/4/0/134096083/vupavuzafumaxut_gebaf.pdfIn PDF document text
    • http://rezonansmusic.com/wuxizuml5uv.pdfIn PDF document text
    • https://febovaze.weebly.com/uploads/1/3/4/1/134131302/4b066a.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/YyGjchb/mizikapilagifupubolifumu.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/gdoageL/wheel_of_fortune_game_app_answers.pdfIn PDF document text
    • http://netewe8.xyz/life_and_death_stephenie_meyer_downloadwm8go.pdfIn PDF document text
    • http://espacecmb.xyz/paporusibevojatilar9cb5.pdfIn PDF document text
    • http://cosmosqrab.online/vujekasatopizoperuw7aqve.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/69445862552gq171.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/zwidheN/vimetufewuwoxijobekejov.pdfIn PDF document text
    • http://wildboost.club/asla_pes_etme_1_turkce_dublaj_indir6cd4w.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/xazisexigamajatuj.pdfIn PDF document text
    • https://limowidijepa.weebly.com/uploads/1/3/5/9/135992559/zavawonum.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UBgZMJ7/86614239410.pdfIn PDF document text
    • http://fitit.space/dexokaluzowakoxozc2c46.pdfIn PDF document text
    • http://in-arenas.com/vonarupsg5uj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakozel.epizy.com/acids_in_fruits_and_vegetables.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_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 5232 bytes
SHA-256: 1786c568caa2c91647c78325de9fc04dfefcedc5567a1d5642431a9cc86c6614
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 12240 bytes
SHA-256: 004098181774b36888de742e61e80a71b1179266af91303cd0e8fe8c0a6c2e77

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