Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b23e7b6e374fb90…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 02:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb00b827191727c0e17f01ac6c327024 SHA-1: 9fa9ff9948f6ba4e1a0ebb7f5174c5a2e6dc8f67 SHA-256: 3b23e7b6e374fb9089a0bf19b10494fb9686810e133496611c0986f420059b06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked content. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://elrey-uslugi.ru/media/file/tuzimetukasebepajetafipen.pdf In PDF document text
    • http://avsa.org/sites/default/files/images/files/vagaduwunorijizuxita.pdfIn PDF document text
    • http://agrion.org/upload/fichier/xugivegenikiz.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/kigire.pdfIn PDF document text
    • https://alev.az/userfiles/file/jubewoxeb.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/guraxazej.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/84a6ddf457f175cdec53240cedf673f8/34258394505.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/76254179054.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/wotapezujawajop.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/72130038337.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/98799901051.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/lipavawo.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/sigofebu.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/97104708161.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/zinipedenodase.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/64361075486.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007f7c359c---42765674927.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/60553655429.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210903_DF15D4F7B211263E.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109190605064643.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/raxuxewudaxojofaponasadof.pdfIn PDF document text
    • https://granitnet.hu/editor_up/dokazasafisuwolize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+way+of+the+superior+man+pdfPDF 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_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 19460 bytes
SHA-256: 1eb45abf765da7b6dec9a45ed3acd2e13bd57416d244febf2434808f4f76b3c8
font_02_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 10980 bytes
SHA-256: 35c4aef9533294d0468e9389e1e89b6bd9228a388559a5c4e652d531d4800cef

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