Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2c7efe4b0e3934…

MALICIOUS

PDF

66.7 KB Created: 2021-04-07 20:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc6476a78f0d4e0e830f1553bf45d9c8 SHA-1: 05a75c535132ce8712d64638caa56ccb1e6b2244 SHA-256: 7f2c7efe4b0e39349def5f6238341581fd883f57a18dc947879d37bae0f9dcbd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic confirm the attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=php+decode+application%252F+x-+www-+form-+urlencoded
    • http://carinsusa.com/348558074455h6dv.pdf
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fef6845e4265.pdf
    • http://gsmall.space/1186048505m6z8r.pdf
    • http://idealslimitalia-oficial.site/10165029540mt7q9.pdf
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fd7c2d898012.pdf
    • http://fdvsefwfrw.space/menuvatikizenilava7u99p.pdf
    • http://alluniversity.fun/tell_me_a_riddle_tillie_olsenmfog9.pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fd662839661f.pdf
    • http://jadebey-x.com/how_to_clean_a_m11_ultraclavehg2al.pdf
    • https://cdn-cms.f-static.net/uploads/4462985/normal_606d01eb83703.pdf
    • https://cdn-cms.f-static.net/uploads/4487618/normal_60505a014389a.pdf
    • http://biweekamnf.com/chapter_12_chemistry_test_answersx8ysh.pdf
    • http://tiktoktop.design/46773333126qqz4t.pdf
    • https://buduruzuled.weebly.com/uploads/1/3/2/6/132682090/dofuvapa.pdf
    • https://pojalizug.weebly.com/uploads/1/3/4/5/134591246/bd9786335.pdf
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/durikufad-xekosodezu.pdf
    • http://specrazreshenie.com/guxovotawimoxiluwakiurw8e.pdf
    • http://arbitestpark.xyz/sarajopunag7z75t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92895fa0-7b02-4ebd-baaf-6cd92f96c210/67182023161.pdf
    • https://uploads.strikinglycdn.com/files/c188aa09-acb5-4cfd-9e97-c4a8d12fb857/armitron_45_7012_alarm.pdf
    • https://uploads.strikinglycdn.com/files/5c157729-4793-4a86-af2d-131b08be10ab/the_future_of_life_insurance_companies_include.pdf
    • https://uploads.strikinglycdn.com/files/a3b7fc81-93b7-4c84-bfa4-65a146b3b8c5/jixepiju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44e.bin
3f6886e9bffe8c6edfeb1535a8a3740cb18bcbd5c19ded2510b932c1d73af91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 5444 bytes
font_01_sfnt_off0000d6d5.bin
c0791d1c980f1f1f4e4c53482babcbc347fc5f28104aca15be852b3120a0bf62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10728 bytes

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