Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3359a7505da9a20…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 05:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 115a0221a24df66e8876818f4ed97694 SHA-1: 2da57479d90b0638e7be8fde9088a74bccecc590 SHA-256: c3359a7505da9a20876543ea114ec8fb872ea77a927179f0bfa652d5832cd1cd
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to redirect users to potentially harmful sites. The embedded URLs, such as 'https://vilenefex.ru/strik?utm_term=psycho+test+book+pdf', are likely used to distribute further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=psycho+test+book+pdf PDF link annotation
    • http://goodsfor.life/77690682713u9tou.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/4a08ce372ad2a3e.pdfIn PDF document text
    • http://ruwulabosubev.iblogger.org/53853837716.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/6088265.pdfIn PDF document text
    • https://tivulose.weebly.com/uploads/1/3/4/3/134318041/5009739.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/7183319d77c17.pdfIn PDF document text
    • http://accface.in/cantinflas_peliculas_online_latinojdw40.pdfIn PDF document text
    • http://studytogether.fun/zasesi4my1u.pdfIn PDF document text
    • http://ideaita.fun/michael_parkin_microeconomia_11_edicioni6feg.pdfIn PDF document text
    • http://harkateine.fun/rerimulodeluvegokofawelqe482.pdfIn PDF document text
    • http://smeh-mif.space/97836079824q1y9g.pdfIn PDF document text
    • http://fineagencyy.com/kejumatixopamob543ax.pdfIn PDF document text
    • http://renijulemigato.iblogger.org/zulerejixogezadidepowim.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/pomowagexafamoxewapofiniz.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/nokiva/29591512004.pdfIn PDF document text
    • http://gegapitigiz.rf.gd/veketuwizanina.pdfIn PDF document text
    • http://zozadugaweguj.epizy.com/fowefejobejemuniluguji.pdfIn PDF document text
    • http://ruxokafa.epizy.com/big_ideas_math_algebra_1_teacher_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/23358993648.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/bulem.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/22534266762.pdfIn PDF document text
    • http://fukoter.rf.gd/how_to_do_plc_ladder_programming.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5212 bytes
SHA-256: f19ea2477a723de3a250da63510c6347fba8f137319c588b59612098858c9b0e
font_01_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 11108 bytes
SHA-256: 1db02c7fdcfd2d56858f995cbf458665f24842541ae09fc98196cdb14a0b79dc
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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