Malicious PDF — malware analysis report

Static analysis result for SHA-256 6205e035a0de05da…

MALICIOUS

PDF

84.1 KB Created: 2021-09-10 00:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9994b2bee26017c2cc8a8051d830d508 SHA-1: 627bbed3a84aa5fcad8e44efa383d880e922fe1b SHA-256: 6205e035a0de05dacdbe811020f09e43a793d0f66926212962ab14d791e984db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=come+modificare+schermata+di+blocco+android PDF link annotation
    • http://lg-palette.com/upload/files/pinotalepefalowafubewa.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/negakag.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/94881098030.pdfIn PDF document text
    • https://etadelloro.it/images/file/11264952404.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/84819173818.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/13013461552.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/1817218956.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/32111752216.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b3b85dac---giwitukerorara.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/pijalojewasuxazugaxatedur.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/487555a7b22289d4489cce95d6b3b2a8/mipepunifiso.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/ditebaligazevotefum.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/siwumabeleguvi.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98019268422.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/gepasulerejuwatumimazavit.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/66128542792.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/69106989821.pdfIn PDF document text
    • https://podimercrm.com/img/files/47687676115.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/lafuvibivopagivu.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/tilawelanutera.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gapab.pdfIn PDF document text
    • https://x-software.cz/data/file/80920023807.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/xaloroturasebirura.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/bowimexobelosijew.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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 17876 bytes
SHA-256: dc283d1a831db2fd90e734d34b16c4a863f81f178f0ea9a8d9269fd719479139
font_02_sfnt_off00012968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12968 10912 bytes
SHA-256: bb457966077591764641f8f2800c63322521fbc30e2209fe935ed98ce4795533