Malicious PDF — malware analysis report

Static analysis result for SHA-256 43401f34805a984c…

MALICIOUS

PDF

67.8 KB Created: 2021-02-17 12:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e1bbdf1d11bd125855804ba0e86ce8d5 SHA-1: 464a70d9b5b694f756c7981fb20d092f9cbc6287 SHA-256: 43401f34805a984ce98ffdcd30ec26ce068f1607b105433a43c49902a11279af
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 numerous embedded URLs, with several pointing to suspicious or unknown domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was generated by a tool, and the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=quadratic+equation+vertex+form+to+intercept+form PDF link annotation
    • http://vekogevev.22web.org/81803600471.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/dAagihG/xosazular.pdfIn PDF document text
    • http://dkblogin-de.best/stanley_j5c09_power_station_jump_starter0yj67.pdfIn PDF document text
    • http://guwilos.iblogger.org/explain_latter_and_former.pdfIn PDF document text
    • http://vertigoa.online/are_all_bacillus_spore_forming56djn.pdfIn PDF document text
    • https://rafopotoze.weebly.com/uploads/1/3/4/6/134609035/8d0feaff4afa65.pdfIn PDF document text
    • https://birulivalofa.weebly.com/uploads/1/3/4/0/134013213/fafovamoxaj_mebogapisof.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ijjjQhc/sumilasikexojugawuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/ihgcijD/midipixonux.pdfIn PDF document text
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/159d8a0eeb297.pdfIn PDF document text
    • https://bapixive.weebly.com/uploads/1/3/4/3/134393773/fuborakozelaferadu.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/fomudebipefasu/album_baco_exu_do_blues_bluesman.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/4457237544.pdfIn PDF document text
    • http://lonozixugixapap.epizy.com/north_carolina_civics_and_economics_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/xerunatozewutexeguz.pdfIn PDF document text
    • http://zazupixuwup.rf.gd/xitixadekitibixosarivi.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/chloroform_for_sale_manila.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_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 5408 bytes
SHA-256: 1f92e34fb705d8c944f0fc7f804312f5c83f2430470569d695f29e50aff04761
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10820 bytes
SHA-256: eb8eb4f8653d0f60a3f1c6df17d9e00cb1ee3d71a8cdbee36a99b3c3b0de978a

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