Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ef77d7444e51c…

MALICIOUS

PDF

70.5 KB Created: 2021-03-09 23:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 24906031841767277b48f3aceaf7642c SHA-1: ef69953b835c1d9b5896de8263923c34e89214eb SHA-256: ad3ef77d7444e51cf3813cd273ed6d66d66a592651260ce7f3085fe5451dbd09
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, including one pointing to 'fokemale.ru' which is likely the primary lure. The document body, though heavily obfuscated, suggests a theme related to botanical names to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=botanical+names+of+plants+pdf PDF link annotation
    • http://topcreditmonitoring.info/washington_state_senators_2020_contact_informationdwoi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_60228cccbeac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_60011aed7bd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_602a0c1aae7d6.pdfIn PDF document text
    • http://bigswinner.space/divine_rpg_portals_guide9zy3k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6047213db3f1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5ffffb5e64cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_15f01fc433ee4e0c94b11c62c10b0525.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3c108b0d05a84f66ae80e9b6fcafb739.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6829fbe8-c2b4-4ebe-b957-46569dc62a1c/why_is_colour_important_in_graphic_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7218c0-2a2e-4f08-aed6-39d47d08d124/25868319660.pdfIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_f65f4d7a65a14d2c8c20a2809135b620.pdf?index=trueIn 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 5256 bytes
SHA-256: e3fef1094f24d3b02b0eb76ef38bfa4e05497e31aa8ab484b959daba10ea1065
font_01_sfnt_off0000e93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93B 10664 bytes
SHA-256: 080f6b77d28b0e4dc6abb87782d3536f5636de9070cd6f69dc9695312cf73336

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