Malicious PDF — malware analysis report

Static analysis result for SHA-256 31dde7b1adc5241f…

MALICIOUS

PDF

131.6 KB Created: 2020-12-31 13:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: e9e55c85c94517984df5a95ff2000cc1 SHA-1: 053dc8c9d8e6d8aeaee47bf8158373c9f2e0cfb4 SHA-256: 31dde7b1adc5241f5b8bf89c45e977172c506196d7e4f7d0ba4a76dc9627c788
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many hosted on disposable domains. This is a common technique for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=barbara+jean+blank+age PDF link annotation
    • https://xotogifove.weebly.com/uploads/1/3/1/4/131406695/setima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445890/normal_5fd6290ae6481.pdfIn PDF document text
    • https://josabinisepev.weebly.com/uploads/1/3/1/4/131452942/a0a4e.pdfIn PDF document text
    • https://fusupolupiritox.weebly.com/uploads/1/3/4/3/134374508/jabukubutejogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fa128e75be01.pdfIn PDF document text
    • https://sanexopapodepal.weebly.com/uploads/1/3/0/7/130739353/tolezijesolaged_gofemulo_fegom.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/773672152774df3.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/sevapu-kutemi-tekumanusuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b410e846-419f-4bcf-afb0-4516c6583c69/topps_living_set_star_wars.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/19388503690.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/h._s._r._a_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/encore_anywhere_software.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_off0001ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA8E 5004 bytes
SHA-256: 8581d6779c43200323e7a1d5fdcadd9621f7bf9f74cbf43f8cd1633013799b3a
font_01_sfnt_off0001dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBAB 11536 bytes
SHA-256: 84a8ac342c6300d4e178041872f35440a228cbb8d7befe84aa4d441d703b61a2

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