Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc819a3654650c3…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 15:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a504986dc05c1030f04816e0ec20711f SHA-1: 8dfe282a24f0c79a00e6b587f56649fcafad8690 SHA-256: 4dc819a3654650c3ce4e59b2c4d95f5a5da68b599da062ce7f95bbdf4da3524c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern of using disposable hosting for multiple links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613435551cc93---2690506481.pdf In PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/vagore.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/34472170174.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/nalugefurewogikidukok.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/86871352771.pdfIn PDF document text
    • http://dd-eng.com/files/files/42505880316.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/difejate.pdfIn PDF document text
    • http://mamam.by/upload/File/file/davivelufilipalunovugix.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/022aa082a275ec6f54cb96fd62ff7ff7/61798219802.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/kotelasub.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/boxikavuwikosi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/65015234761.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/84506177598.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/rakakuxowot.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/69427061200.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/lewosebegokebepedobevita.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/mimapug.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/futadodige.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/lalorematituxupazevik.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/tafumenutuxix.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/11315193608.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/45093273837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dog+face+meaningPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/vusutemodaxapu.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_off0000aea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA4 16736 bytes
SHA-256: c4f54095f21a9ca3485baa25c3f5716b5a65e256f881c76508e90dda5d3e68d3
font_01_sfnt_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 10268 bytes
SHA-256: c3f3ed5d8857f30b0a05af670f155bfdc1af119f5bbf892e508730174e903ec9
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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