Malicious PDF — malware analysis report

Static analysis result for SHA-256 872fc75d87d44d08…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 23:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c13b7c141913b8254a642b15cf2a2048 SHA-1: be98341c37264f500c7a5fe23a0278260ce7cd02 SHA-256: 872fc75d87d44d082352f094a4f9c54f81343d8fddb1fea32f61acc92e515d49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content are consistent with attempts to disguise malicious links or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=free+watch+faces+wear+os PDF link annotation
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef12041d2---givavuwagud.pdfIn PDF document text
    • https://norservis.com/files/files/wagulewilovovelutigulobuz.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/25266063654.pdfIn PDF document text
    • http://ombs.ru/uploads/files/76613642222.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/25408073168.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/kovejawezexuzurexafosude.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vosubinedelunaf.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/dogizizudakovujasagutun.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/74162632528.pdfIn PDF document text
    • http://podarox.ru/public/files/godujagutarasevov.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/kusakaxaratas.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/sidufaga.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/wigijizowoberamosavamate.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/mitotutakore.pdfIn PDF document text
    • http://congluc.com/upload/files/tawosirovune.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/99651835856.pdfIn PDF document text
    • http://zzquansu.cn/d/files/99604032348.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/mapeneroxoroxidokej.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/repugurevovawepuwidakenu.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/5026215854.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/zanexopenixodurawafejo.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/xaresolotukupuborov.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_off0000ad56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 16116 bytes
SHA-256: c866e51e1b3dc1a745e8a68135d4c6ab6f5f7e67973956d2203ea166104379d7
font_02_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10252 bytes
SHA-256: 22fbb7d4c0e8043ef2f31a9f49b43ef03f52670f2a8bfb1ac7b4af6323f6455f

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