Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1f78cbaa552a9d…

MALICIOUS

PDF

72.5 KB Created: 2021-02-08 09:07:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a4ddbc9b83822d691007659fd78edb4a SHA-1: 6807d2ae1f35b67bb080dda181fb524a866d200b SHA-256: ca1f78cbaa552a9d7f026016e009c0290b2add134bb180f2b964e15bbaece436
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs and embedded links to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a book search, likely intended to trick users into clicking through to a compromised or malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/wb?keyword=autobiography%20of%20benjamin%20franklin%20book%20pdf PDF link annotation
    • http://azorocheat6.xyz/39502232104uov23.pdfIn PDF document text
    • http://all-host.site/warm_tiles_easy_heat_manualjesdc.pdfIn PDF document text
    • http://bigwin-1xbet.fun/imperialismo_economico_en_mexico90924.pdfIn PDF document text
    • http://cmb-accueil.com/aberrant_spectre_slayer_guidebm26i.pdfIn PDF document text
    • http://xsafak.com/apple_pencil_2nd_generation_won_t_chargevg35f.pdfIn PDF document text
    • http://itprod.space/paper_crafts_origami_frogki8p7.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/670002.pdfIn PDF document text
    • https://gusotefatimadi.weebly.com/uploads/1/3/1/6/131636747/tonebobuxowij.pdfIn PDF document text
    • http://prazdnikprosto.ru/balapam_patti_telugu_songmelh8.pdfIn PDF document text
    • http://gonzo-3d.com/38556594554gtdhy.pdfIn PDF document text
    • http://veronaital.space/257113502139a81t.pdfIn PDF document text
    • http://portkamesto.site/boku_boku_lyricsadxt9.pdfIn PDF document text
    • http://sell-toclick.online/683649438424ems7.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/dejolavubukugeb/oracle_api_platform_cloud_service_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/28_creencias_adventistas_resumen.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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 5648 bytes
SHA-256: c3bd0f659774fc268adde728a9feba6b13a0c01ce4db5e03db5a0705c2511ec6
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 9744 bytes
SHA-256: b290befe1516f469aa3bc834dc3d55e4390a42493b2b3a34c05bac511f662557

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