Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30e45d231f4d897…

MALICIOUS

PDF

81.1 KB Created: 2021-09-24 03:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adccf775a46301c277b8b6a6a7c185a8 SHA-1: 28acfd1ad2576dd0b75ac8132bb580f247935fa4 SHA-256: f30e45d231f4d897f35b4927f94e55a325a13bf2543c70afff69d6c1eaf582ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, suggests a phishing attempt to trick users into downloading further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this deceptive linking strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://denprokhorov.ru/images/file/risenilenuto.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/7587591431.pdfIn PDF document text
    • http://17njl.com/userfiles/files/69867857029.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4d24cdca9b1219cf431951b8ffcf9550/ravaloguxomupuzuto.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/70719790561.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/gisevunitalifuwivaf.pdfIn PDF document text
    • http://schokozentrale.de/idata/digitojifer.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/mirosenowufidezo.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/91707583520.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/muvopo.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/jaxawunediji.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/64343780005.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/labivarekuzus.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/16643969106.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/ziriwiberugoju.pdfIn PDF document text
    • http://kasand.com/userfiles/97824523131.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/dinosiposijomuvovut.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/15973379610.pdfIn PDF document text
    • https://sanidom.pl/img/file/83725661090.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/juponakit.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/66295377552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reset+motorola+android+phone+when+lockedPDF link annotation
    • 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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 10948 bytes
SHA-256: b65711fcaa4a9f2585657427df909132ede2548ed672b1d09718d5f44a0ac950
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 17652 bytes
SHA-256: c06b9f948e66654bd2de7be9a371ec247e3cf165e5c799357ab46c83ff0b806d

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