Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13a09cd2ecf07ad…

MALICIOUS

PDF

81.2 KB Created: 2021-02-14 18:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 411c1c4756f08ce24853dbdd23403371 SHA-1: eca3908b029ceec56e1a23f06d3127b72943f622 SHA-256: a13a09cd2ecf07ad0958ff70d5ec0c5bb8867cc258f8b7fb938f63b93a68194c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely a spearphishing attachment, designed to redirect users to malicious sites.

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/wix?keyword=3.3+3.3+packet+tracer+explore+a+network+answers PDF link annotation
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/8850959.pdfIn PDF document text
    • http://zegofivuwirukon.22web.org/define_acquisition.pdfIn PDF document text
    • https://xufetujada.weebly.com/uploads/1/3/4/7/134745175/5751622.pdfIn PDF document text
    • https://vixewomofuv.weebly.com/uploads/1/3/4/6/134606761/gimazulesaso_vegijodokulona_susolawuxe.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/6751278.pdfIn PDF document text
    • http://ligazilafibab.22web.org/69008400084.pdfIn PDF document text
    • http://rinuzaje.iblogger.org/gamuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_5fd113ff8542a.pdfIn PDF document text
    • https://sajinekud.weebly.com/uploads/1/3/5/3/135391411/65aca0d1c8317.pdfIn PDF document text
    • http://ruwulazitu.iblogger.org/66393547941.pdfIn PDF document text
    • http://xetelafeke.iblogger.org/metro_map_paris_france.pdfIn PDF document text
    • http://idealica-official-it.website/free_inference_worksheets_5th_grade33kn8.pdfIn PDF document text
    • http://findssldz.xyz/befikra_full_song_mp3scz0r.pdfIn PDF document text
    • http://krokoboko3.xyz/78241913337vf1l0.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/522644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziboporo.epizy.com/43697797578.pdfIn PDF document text
    • http://rozosijamuruxo.rf.gd/61848061566.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/adobe_creative_cloud_desktop_app_pc.pdfIn PDF document text
    • http://jogatitow.epizy.com/verigatekuteluwarod.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_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 5252 bytes
SHA-256: 632e9af3f7e72ea08e23e5c74f510d3d6e0136a8cb2b0024cae44dd0702110a9
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10196 bytes
SHA-256: d2a0487d7c3ceb7e829187b65f803b4f3fdad7a0f9fb5c96c485fc7ed5de92cd

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