Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc09b452e8aa81b3…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 18:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 097ecdc680deca4ae131a70156e7643d SHA-1: fbba3fe6e783f376273786b8a5ff4da1fccb4eb5 SHA-256: dc09b452e8aa81b355dc701bcfa632c1a8f50e0fecbacd65f3356dd2212522bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable hosting, likely to distribute phishing content or malware. The document body is unreadable, but the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggests a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://huntic.ru/uplcv?utm_term=hunger+games+catching+fire+book+online+free+pdf+download PDF link annotation
    • http://zhjpharm.com/upload/files/jedibabe.pdfIn PDF document text
    • http://araulmor.tel-cor.com/images/library/file/45450146459.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/ribuxuzizisogevawalekub.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/talakogoxaf.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/mefonuwemudo.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/peletovoxavoxijipawul.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/13341970751.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/nitem.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/fobavifotemenujosol.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/vurigurukim.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nugufupoxinuvuxejivubireb.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136555541599---59133442444.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/b59sg7mtgl0psl5841idbj70rd/62553748732.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/2385815854.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2100352354614752c00ed73.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/86214797815.pdfIn PDF document text
    • https://stormester.no/files/file/pejuwoxosuvuxinuxolade.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/romemasibugamagewip.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/fifigidu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kenafapilanu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/75073008293.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37404836696.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/xepenujad.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://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_off0000cc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7C 11476 bytes
SHA-256: bf8f54945229aeb37bf14154aebdd30d145cef1c553311a76d27abe9d0e8ee50
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 18572 bytes
SHA-256: 841520c4297db33a9c455f3ffe33adfc5b9628e04fae2764106e2f77be393d84
font_02_sfnt_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1