Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7532b3d1f33dcf…

MALICIOUS

PDF

74.4 KB Created: 2021-06-10 22:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6280bc639d9ee22cf839ca5c0c309513 SHA-1: 91fe44b23af2beeeac35b9bb12eeb1a78526a375 SHA-256: db7532b3d1f33dcf8cbd3d1e9a79a8d8cf6dbc8c3d98b62fa425f63321489c53
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/pbw?utm_term=filmyzilla+hd+movie PDF link annotation
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/letopezizobujo.pdfIn PDF document text
    • https://wirujofijiv.weebly.com/uploads/1/3/4/5/134592393/7618642.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/vedegejegu_zimizogopixidid.pdfIn PDF document text
    • https://nojemalof.weebly.com/uploads/1/3/0/8/130873850/tijofubi-pawozo-womikupemoket.pdfIn PDF document text
    • https://zibakuponitek.weebly.com/uploads/1/3/5/3/135303957/geligoruremen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_60349d367e2fd.pdfIn PDF document text
    • https://jutemutugitut.weebly.com/uploads/1/3/4/6/134617260/2450658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_605faee544e83.pdfIn PDF document text
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/wojexizem-gazunuginaf-zuvurogi-pepejese.pdfIn PDF document text
    • https://sidusumidiwef.weebly.com/uploads/1/3/4/3/134366372/mepewadixizerexem.pdfIn PDF document text
    • https://gilitizek.weebly.com/uploads/1/3/4/1/134131368/xafutifoni_wuzaze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_603bfe2341dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417141/normal_60141c2f9500a.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/10274e44-a527-4ca2-9e1a-a19bfef4ed5f/53889700232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34a6349-d9b4-49e6-becd-2643960c71a2/juzagub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2270dc3-1eb3-43b1-b5a3-d2b99c770b6e/43584721262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e72c01-9794-4a64-b78f-75063417465d/19954676415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fa626a-88f3-4471-b409-783665b2c4dc/feeling_start_of_uti.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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 4960 bytes
SHA-256: 54465bb461a140eed6c1b0c594e3fb906eefb10bba389aac3cd425a24e45cba0
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 10556 bytes
SHA-256: 40c2996639a9718a996515a5b8e9058b05fac20613cc579751e6ac06318c55d8

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