Malicious PDF — malware analysis report

Static analysis result for SHA-256 8143fd3ef7d35554…

MALICIOUS

PDF

79.8 KB Created: 2020-12-17 12:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f7a67f3fb6a6cbcc60afaec7fbef5caf SHA-1: 90b43b642e8c6a9b3e19b64ee8f873aa427c55b6 SHA-256: 8143fd3ef7d35554698835d4cc9e305ba21f031a4937fd03dc3dd9a96e4064a8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/strik?utm_term=intex+pool+instruction+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8e4d04718f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f96184b7ef9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5f920d740a808.pdfIn PDF document text
    • https://vasabofilusav.weebly.com/uploads/1/3/4/5/134585229/45535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f90a5b5a56a0.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/7316f93c-7723-4b1c-abce-3c45fcd088db/wosegatagom.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19d720a2757459be7f0be/t/5fcc97d974a40730fb941661/1607243742168/carrot_fantasy_2_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95dea449-0c79-43c5-8a9f-5f5728836596/tezanil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25eac356-c280-4ab1-a5ae-1be04e51eecc/bexanisoli.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc106a17848ba205d193829/t/5fc721282ac13f1ee9b4b112/1606885672959/33816342646.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e1448ef7301f8b1097bc/t/5fc2fce5f8cdb769c645f5fc/1606614246458/54059733580.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1b0084698658e5e73ac/t/5fd1d62a1693665fc7d2d355/1607587370232/14571823175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddc39b7-74fb-4b75-86e2-36f1b4f7afc2/32098152406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8443b964-729d-489e-9423-e25c9401a214/super_metroid_norfair_enemies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716af5a7-78a1-472e-87c9-ff7b0a49c271/fc_2015_squad.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 5084 bytes
SHA-256: e4228d825b99a9b25e2869fc3b65968faa7fb0ac8258034d1c6b783df8d84744
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 11208 bytes
SHA-256: 1eb024d5c1721fd24d6a67f42eef7ea8bad9c78d11952a9912cf83b8a7f8bb1a

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