Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c66680d3db979b…

MALICIOUS

PDF

135.1 KB Created: 2021-04-07 10:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34e9d68309087876078cb3d1890c82d2 SHA-1: 2110e8a799466a2a116b5066326fc4012b657ae2 SHA-256: d6c66680d3db979b307795bc161e98b5228bdc6f73dea51e586cf34d3ef78d94
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=intubation+guidelines+pdf PDF link annotation
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/9481420.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/0944a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60239f7acf185.pdfIn PDF document text
    • https://bilugiwunifi.weebly.com/uploads/1/3/1/4/131408415/7955793.pdfIn PDF document text
    • http://manenumo.iblogger.org/american_heart_association_acls_guidelines_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_5fd8541832a1a.pdfIn PDF document text
    • http://rusefogotomik.iblogger.org/8004969440.pdfIn PDF document text
    • http://duperalenow.22web.org/grammar_and_vocabulary_for_advanced_book_with_answers.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/1304166.pdfIn PDF document text
    • https://sekagerufelijet.weebly.com/uploads/1/3/5/9/135965199/zimaverumef.pdfIn PDF document text
    • http://salizib.iblogger.org/jikiriwarejasaseloriso.pdfIn PDF document text
    • https://mezemefi.weebly.com/uploads/1/3/1/3/131384279/sikugazunuxozevalasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470024/normal_60354c2a1e5b9.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/793568.pdfIn PDF document text
    • https://nigomisenavuluw.weebly.com/uploads/1/3/6/0/136095850/3935429.pdfIn PDF document text
    • https://nemaxalifaxibox.weebly.com/uploads/1/3/4/6/134627725/ronamuzozot-kewijenoranepog-musazujuwe-sivubuzuratexoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467036/normal_605968c65f955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_b10de85cd5bd430db2cdfadb5e14cc2c.pdf?index=trueIn PDF document text
    • http://bitixojofesozi.rf.gd/hoover_windtunnel_rewind_vacuum_parts.pdfIn PDF document text
    • http://wotirazobobag.epizy.com/winafogowolupusenesuv.pdfIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_adab288323a34fb59e6f4a1d43b5a72b.pdf?index=trueIn PDF document text
    • http://guxudapese.epizy.com/cdr_file_format.pdfIn PDF document text
    • http://mebebopolimo.rf.gd/57844070586.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_b8806c371c584cc4aab722fd881f9773.pdf?index=trueIn 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_off0001d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3F2 5192 bytes
SHA-256: 402348006241a2966dbcc91371bd2e966c76ca47ff39ab51cc518b986dfad6a5
font_01_sfnt_off0001e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5AB 12108 bytes
SHA-256: 2adaf97e80fcfa37fb72b0ff22362042ebfaa6afa88be9489130064209bc0d61