Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32fe77d2da2f3d4…

MALICIOUS

PDF

95.8 KB Created: 2021-09-17 10:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bb248a25781cb950b7805f08ecfdd39 SHA-1: a83e7357834f8a817cdab04a90c68e3188c76b10 SHA-256: d32fe77d2da2f3d4fc4feaa12ba6babc12b9a6ef232f677c7aceb9acd2beab7d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, likely to obscure the true malicious intent or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://pixomot.ru/uplcv?utm_term=unblocked+games+no+flash+player PDF link annotation
    • http://ordineveterinarireggioemilia.it/userfiles/files/90066754448.pdfIn PDF document text
    • http://caythuocnam.org/images/files/52747627898.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/wororiravuge.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/gisivazamuxaduvozezur.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131495f41faf---29976992709.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/68199120515.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0e4f119---kukemarolamoruguvufizidex.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/funizimexoxulir.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • http://fedime.org/imagenes/77518964973.pdfIn PDF document text
    • http://laduses.nl/image/file/92215167079.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/66477832163.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109151733379064.pdfIn PDF document text
    • https://matratva.in/userfiles/file/13971408372.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109071701328829.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/ramezuvubine.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/50664662897.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/85343172290.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/66611303595.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/5971233839.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/19447932006.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/lowojabeveragobajil.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/55115181099.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_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 17632 bytes
SHA-256: 44e77f773f036d8a2dd9cea43ffd1eaa8128b4963eb76c519b5a8dca1ac68658
font_02_sfnt_off000157e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157E4 11232 bytes
SHA-256: e76365c08d6aeab43281275016bd31a9583761654e3baa48bb72d48362711393

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