Malicious PDF — malware analysis report

Static analysis result for SHA-256 6633f316ef2859ff…

MALICIOUS

PDF

75.5 KB Created: 2021-02-24 13:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d45766f72a2e9059bbabfbda7ee43991 SHA-1: c46dca3782ede9fffc55ea57cc3faa177c174d3f SHA-256: 6633f316ef2859ff4eb776c243024c6c9942835dc12f66f2c6ed847d7c3bd5c9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a malicious intent to redirect users to potentially harmful sites.

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://crophysi.ru/wix?keyword=camel+clip+art+black+and+white PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fec4fd720d5e.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/jjicggb/cat_jumping_into_ceiling_fan_tiktok.pdfIn PDF document text
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/4521400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ffe6ddf4bd53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6009d0ae53670.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/gb3Crjj/14123811699.pdfIn PDF document text
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/42500c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463812/normal_5fd7c6203000a.pdfIn PDF document text
    • https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/forupawujej.pdfIn PDF document text
    • https://cdn.sqhk.co/bafuberudod/f1haDp9/medbridge_healthcare_112_raleigh.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/ghg50ji/nopatutiduxonam.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/10beef9.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/bdad95.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/cMm3jfn/gravity_ninja_2_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_5fdf9109a36e1.pdfIn PDF document text
    • https://cdn.sqhk.co/fuludasowipu/iOHibhh/pinball_arcade_ps4_tables.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

Related samples 8

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_off0000eb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB99 5336 bytes
SHA-256: 3aa67c72890b2660a5df2dacb8c7f5bfae2c53d758800e99268224d4d3f41e49
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 10360 bytes
SHA-256: 4630ef2c18928cc2d5b69c1efe0e4ace7e81a9f2a2493f42d239c046757a24d8

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