Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f8e2d086309236…

MALICIOUS

PDF

63.9 KB Created: 2021-03-28 01:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eaab488090b170122fe28151471e3282 SHA-1: 9c07a555452b0f8e7e6298673c833c9911474e7f SHA-256: 53f8e2d0863092365ccb3ff15170bfcc65732695a24ab1ffc54b11ba69ef094c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://resalured.ru/strik?utm_term=what+is+the+standard+enthalpy+change+of+formation+of+iodine+trichloride PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471992/normal_6003f45016e1e.pdfIn PDF document text
    • https://nujodobenume.weebly.com/uploads/1/3/4/4/134441993/763224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459478/normal_6032e4ac16670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454042/normal_5ffdc457175bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5fef88f3cd875.pdfIn PDF document text
    • http://xefenudopete.22web.org/8856817598.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_925c7b57223c494d87ad9643a409f0d3.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_3cc6859b30ec4e998ce9ff90a2f9fdbf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/brookfield_dv2t_viscometer_manual.pdfIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_dae904950563400e9a82e3ac0281428a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mufukep/42080980231.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/23266698863.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_378009248d8643629c1c8d8b0e61cec8.pdf?index=trueIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_0bdfe679ea6f4ce09fcb9c688291e688.pdf?index=trueIn PDF document text
    • http://wajodojizofe.epizy.com/momepizofokowo.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 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_off0000bb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6B 5684 bytes
SHA-256: d4b383395825ba707de99afe27863f5e1aac0578ffccd8f5afa05eabd8d0c315
font_01_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 10564 bytes
SHA-256: 8d05f02d03641c1ad16ef1f24ab62880ad6db40e5c19964568bd5ee93a9b57e6

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