Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb826c0c85fd20e1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 07:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c631afa684350fb2c0a3a1cfe4ef70bc SHA-1: 26d83e0f2bb462e9549cb7a3872e139619724803 SHA-256: bb826c0c85fd20e18e6a11607af05b00abb55a03f321bf8536d6dd8f4bcd6340
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this is a phishing lure, potentially for callback phishing or a tech-support scam. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the distribution of further malware or phishing content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=m+launcher+apk
    • http://peknanevesta.sk/media/file/63928016639.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/xuvupe.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0688e672c2537e4d94b505e4257b42f1/pufazilulunimi.pdf
    • https://ddtoyz.com/ckfinder/userfiles/files/xesuve.pdf
    • https://novsport.com/content/File/dapovamilezivonu.pdf
    • https://esterkins.de/ckfinder/userfiles/files/rigopugakijar.pdf
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d40b580ecd---fawuvotivokanidoresosuxes.pdf
    • http://natpuedu.in/userfiles/file/pipisalajorugakifol.pdf
    • http://eaupureinternational.com/userfiles/file/68834386204.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/xufuvemokubewisid.pdf
    • http://bsa-billiard.by/images_from_html_editor/file/sozixerepamosefit.pdf
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafufebube.pdf
    • https://fundacjanadzieja.com/images/wyswig_images/file/54539568846.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/zudazu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16792 bytes
font_01_sfnt_off0000f7bf.bin
8a81f5aa4554c4a0c85a8bec9cb7b03e0f60019654114f110e192a7440613812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 18912 bytes
font_02_sfnt_off0001290d.bin
62d517ff1d837812f70e4014964588db49cce4a9aac51335e7f20be750d383ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 10176 bytes

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