Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c8936ce16faf9e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 09:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 93b07435d52ea84b733b1b6e106d6dc5 SHA-1: 60cff4ccab8655ef2cc4462bbef67f0d792a88e9 SHA-256: 29c8936ce16faf9e60b338581fd7849a2788ca0d97be756ec99f92ab4ec49408
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The `wkhtmltopdf` authoring application indicates it was likely generated programmatically.

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 https://garglob.ru/uplcv?utm_term=android+app+xml+templates+free+download PDF link annotation
    • http://drukarnia-warszawa.pl/pliki/file/44324596448.pdfIn PDF document text
    • https://myoffice.acqualive.com/uploads/files/63212508541.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/13408062519.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/170552446791.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vimitotobebodono.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/3473314289.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/paviresumemikopusozi.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/funukowab.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/12636976333.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/bunarabojiziziwifomozafoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af1a98ed9---suzosanobidag.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/tizedamarewopijujez.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/2922113037.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/luzajitezobaduxinev.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///butimu.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/83538515235.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/73886601300.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/tepudavafekos.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/25985764314.pdfIn PDF document text
    • http://cutskytools.com/d/files/fofuvafobexodovobotovetu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/15747745734.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/momonomisomixale.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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 15764 bytes
SHA-256: 054935561a93f8ea9b3f5c042aa977155a110ff45888b91b58e4f22ad981c1ff
font_01_sfnt_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 10828 bytes
SHA-256: a77d61938bf73912a58e58caa75d0f3d36e20b6fee38de6db51ae59c8b1a4885
font_02_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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