Malicious PDF — malware analysis report

Static analysis result for SHA-256 510e41c3b1a04853…

MALICIOUS

PDF

88.8 KB Created: 2020-11-20 09:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d49d03020baf78eea71cbe810c21fc5c SHA-1: 5fd20fa78808df9acfd1a8f9962afeaf916ee1ee SHA-256: 510e41c3b1a04853fd2b88b8aecc5549f7f1f8c4319754d5a75a1b37aa85a2cb
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/aws?utm_term=alfred+hitchcock+three+investigators+books
    • https://cdn-cms.f-static.net/uploads/4450251/normal_5fa34f7597581.pdf
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/8509832.pdf
    • https://latabiwot.weebly.com/uploads/1/3/4/6/134612911/6516783.pdf
    • https://sivanijizifi.weebly.com/uploads/1/3/4/8/134848714/vapukibevol_nagovukiz_dedozilevop_dadewokusupo.pdf
    • https://nutefowamedez.weebly.com/uploads/1/3/4/3/134330341/gawilepafi-rogemevezibo-jixem-nagowenonel.pdf
    • https://zafapeniledepur.weebly.com/uploads/1/3/4/8/134846756/4469061.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/dapujuzuviwajom.pdf
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/8309a3ae7.pdf
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5f9bd40a9c327.pdf
    • https://funudenor.weebly.com/uploads/1/3/4/3/134319253/d7593b344fe.pdf
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/2418122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/juvosi/lisovanigikibata.pdf
    • https://uploads.strikinglycdn.com/files/ea170755-41ce-4aee-a326-1cfb9b0a0743/gaximenomu.pdf
    • https://s3.amazonaws.com/rubidokezive/38731850320.pdf
    • https://uploads.strikinglycdn.com/files/92727336-c787-4ccd-a438-782b3e2a909b/dojibefoxopajukitox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011baa.bin
164cdac67da9a5efb08d4854c778450afc608ec1811d9e395a54df5710bf2904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 5536 bytes
font_01_sfnt_off00012e80.bin
c03fa1c240e7322819b62d6c937e12c6cb9618cb19f1d1eabddd90ba7906132c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 12372 bytes

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