Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce37f5c0f9807f3…

MALICIOUS

PDF

66.3 KB Created: 2021-04-05 10:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5914365d6cb83ed54a1a895947512216 SHA-1: b3b37b929b6f830411d00a294a81fc574c3dc5ad SHA-256: 2ce37f5c0f9807f313294105e0071442a760e82abac048ca81d6a46e3a663f23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it functions as a link farm on disposable hosting, directing users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery, by masquerading as a legitimate document.

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://golowaki.ru/award?keyword=calculus+12+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388178/normal_602ed2bbb022f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_606a7908b6092.pdfIn PDF document text
    • http://xivatididoxu.22web.org/42960376226.pdfIn PDF document text
    • https://cdn.sqhk.co/nisifowisom/zihJ5hf/camscanner_software_free_for_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fce99bfdd6ca.pdfIn PDF document text
    • https://cdn.sqhk.co/roxigeve/B4iihPQ/road_trip_planner_national_parks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451377/normal_6040274e9eef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fd9408b920de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_601c7bd8cec15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427514/normal_6007fc4e423fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405930/normal_5ff83b456af46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fezavirofi.epizy.com/born_anxious.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_4891ab96f3094e9fafeb546884ae9635.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_fb5ce6e85235469387f0cd0d50842e17.pdf?index=trueIn PDF document text
    • http://budevoniv.rf.gd/el_tratado_de_bucareli.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_bea0a2f2e6564d7f9b4e880fe9dff932.pdf?index=trueIn PDF document text
    • http://kodadus.epizy.com/45969003575.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_fcbdf8b16d11490e9eab5ee93fc63fdc.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_ca5c3b6d4580499fb979df226cb2b9e8.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

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_off0000c6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CB 5412 bytes
SHA-256: 3ad6f8c16b90fadef78ae1428fd6c260728a44e7aae605d9b3c6951d94b86027
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 10332 bytes
SHA-256: 473c2568472c6e4dfd57cd35aeee9527fbb967e4ac341f620ac32c8ebec052e9

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