Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a5f71dabaf57a8…

MALICIOUS

PDF

74.4 KB Created: 2021-02-14 16:48:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1ff4a6f471260eb6ee1e72d3524e483 SHA-1: 6a595f0ed5bbb2cdd5ae4fe1ce8c100b2cedc97d SHA-256: 00a5f71dabaf57a8d9d5f73144417a82ce55ea9aa35c461169958760f17fa17c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with exploitation techniques used 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://druttle.ru/123?utm_term=the+washwoman+summary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fe412999b4cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6012bf4e9fcae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447880/normal_5fde66a375774.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/xekowoselakuk-ridaja-mifopi-jowotunawuboz.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/553274.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/free_music_websites_for_schoolyvlye.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_601251e5236e6.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/9c2c40215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_60090a4f154b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_600e9e7c378c3.pdfIn PDF document text
    • http://trikotoria.ru/study_guide_for_bone_density_certification9raem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5ffbe2214f76a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427811/normal_5fcf3533e447a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/maintenance_planning_and_scheduling_template.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/19077516643.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/48989647022.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/reporter_online_malayalam_news.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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 5036 bytes
SHA-256: e765f2ef8851696ebe71dbca3da822d5b866294d7dc19b696ec5f589fe9203d4
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10436 bytes
SHA-256: 1f0bfed45abda4db748d9c98b1d90a4a3e568a5df036b5509c464539773ca82c

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