Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf99fba64befc992…

MALICIOUS

PDF

73.1 KB Created: 2021-02-21 17:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f054b122691eaec7f0b7b9ddc14b4b9 SHA-1: 76967c19f4ed45c94486d8002c72f5e52ef48d96 SHA-256: cf99fba64befc992062b48a3226e35fce21002bdf32f0ac9c29fb3a0a716de16
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content or phishing sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wb?keyword=little%20red%20riding%20hood%20plot%20map PDF link annotation
    • https://cdn.sqhk.co/fumamimed/Km6gghf/51359673839.pdfIn PDF document text
    • https://dojixevagix.weebly.com/uploads/1/3/2/6/132682303/5cea8b5.pdfIn PDF document text
    • https://jafusakivamo.weebly.com/uploads/1/3/0/7/130739280/gizoxozisatis.pdfIn PDF document text
    • http://euroshopme.site/revigowubutiperhc6kn.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/zVyBHja/casino_magic_free_slots_no_download_no_registration.pdfIn PDF document text
    • http://requiremcgood.com/772207102960yc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5ff3bc7dae17e.pdfIn PDF document text
    • http://afracheat9.xyz/blockman_go_apk_hacktec59.pdfIn PDF document text
    • http://kemytbok.xyz/37729622195n1zlq.pdfIn PDF document text
    • http://sluzhba1.net/degozuxapazamvh0o.pdfIn PDF document text
    • http://prodive.su/60553486977vj9gk.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/fhaz0da/dragon_city_breeding_sanctuary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kofabube/unity_asset_store_top_down.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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 5136 bytes
SHA-256: 9bfeb8af4233b339ad2dfdb64bb25cafadb0865ff8b770152691c6c3767aa933
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 10484 bytes
SHA-256: 0e22d517f286b5cccfd7ce0a1902c3ef96fb0f93971077a20453590797bc4347

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