Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae07bf19b1cd09b…

MALICIOUS

PDF

70.7 KB Created: 2021-01-31 03:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1b84e8f91f11f878dc44710fc89e32a6 SHA-1: b969e8b98e2f3e73b12834b9b2933831fbdcf155 SHA-256: cae07bf19b1cd09b6e98dfc32a23d710ce5c4f132e0800e5acbc4c1e0d3d116d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL suggesting a lure related to "exploring microsoft access 2013 comprehensive pdf". The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=exploring+microsoft+access+2013+comprehensive+pdf PDF link annotation
    • https://cdn.sqhk.co/jememobak/plFgcji/9075493680.pdfIn PDF document text
    • http://rotixumuzu.22web.org/aphrodite_true_form_battle_cats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482645/normal_5fdaee1262c13.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/hihaPr6/extreme_sky_parkour_rollers.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/hhhe16l/zubup.pdfIn PDF document text
    • https://nifiguxo.weebly.com/uploads/1/3/1/3/131398563/97438.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/hjaB9rZ/lakosujus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455381/normal_5fdc5069f2cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_600a6dbc52c45.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/linevaj_famusib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fe994c81369d.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/fotulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417213/normal_6015db15c0e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_60068f94c4390.pdfIn PDF document text
    • http://fefogumok.22web.org/logical_thinking_questions_with_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 6144 bytes
SHA-256: 88373615ed84094d95790e794f5768c9afe9248ad24cd7f1f471df347f767990
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 10956 bytes
SHA-256: 7a1e653e2d63bfb055b05f70e6bbde43c14bfe92f25924ea4a48cc6da65e8336

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