Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5911f9e3e1e89f…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 07:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5779cc0ad4e07780ee4c7cd1364b68d3 SHA-1: c79bb4757930f0fe19481052894827ee3ad03e5e SHA-256: 5c5911f9e3e1e89f74b1b6fc179e5fc1bd1c5778ea8c6fc2a60ab0fb19aabb85
186 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, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The embedded URL https://mezovuduw.ru/strik?utm_term=what+affects+capital+budgeting+decision suggests a lure related to financial topics to entice clicks. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mezovuduw.ru/strik?utm_term=what+affects+capital+budgeting+decision PDF link annotation
    • https://cdn.sqhk.co/naziwixolagu/jfiigdb/mosixajonuvexij.pdfIn PDF document text
    • http://3203epworthcres.com/didisexazoworugopaneb541v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_602ca0cc8ba73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473062/normal_601677d9c802f.pdfIn PDF document text
    • https://cdn.sqhk.co/zitedefew/sLxjhgd/sojanitopeve.pdfIn PDF document text
    • https://cdn.sqhk.co/kubepugemaki/thjdD1y/75093282532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fedf45bc46d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_6031e0c39ed12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_603294e20e4fd.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/70147650172hx06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_23838477a99146bd914b0648881903ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab0319c-042d-4a7f-92d6-be40712e95c8/22765459859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0498a9c4-b93a-41ba-af4b-4b5d33aa76e1/93823744799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8988c050-c863-4bfc-b8c1-b0a5d74f2afc/77753195897.pdfIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_064d1a6e53b04e74a4c8be609a0d9ccb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0595f106-b488-41fa-81d8-67b0ce41b4cb/33988887101.pdfIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_6eaabe1cdd894597b37010685ec22ffc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5e9499-943c-4365-a5c1-49d9261a8187/is_the_old_woman_athena_ac_odyssey.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5476 bytes
SHA-256: bff7b7bb4880c2991a4b92a223b5572f8ff3efdd44925704316eafff09e91d41
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11128 bytes
SHA-256: 3b41e1efb603800f6899e201ba66f774e25ac3abb1667a1d1e475df04364bdd2

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