Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7871be2d367507b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 02:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dee99ddb9976b389ff42a8954c10e50 SHA-1: 7a1c238c8b47ec6cec59e04e4b308c90f6a292ae SHA-256: a7871be2d367507be82c8bbe0e45f916fc4c2e9e256c109f91c02473c59073d3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm and a callback phishing lure. Although no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or facilitate phishing. The presence of numerous links to potentially compromised or disposable domains supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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 http://stlukesfp.org/ckfinder/userfiles/files/rubibibuninodipagitu.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/35799283856.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/4832220254.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/tafukegiguxolekedazoz.pdf
    • https://eownauto.com/uploadpic/files/wemejevosogumapelat.pdf
    • https://pmms-online.com/assets/file/kusasazipizedilerug.pdf
    • http://koala-al.com/d/files/gavijofokoxo.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/64669798783.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/30595682927.pdf
    • http://sicilyontable.it/userfiles/files/lapejata.pdf
    • http://kingkady.com/uploadfile/files/74164603237.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/jegerabuzetop.pdf
    • http://soojuspilt.ee/files/file/zekudemefivu.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429eeb27b94---xewinoporilisalo.pdf
    • http://newkontakt.ru/userfiles/images/file/julifatusoxivefebewegis.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bupajefebanujawo.pdf
    • https://reha.bg/content/upload/file/90328017260.pdf
    • http://plncse.hu/php_data/file/44753941800.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/70417649174.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae2112603b2b7607615e12b16d8eee56/kapugobosovufogulure.pdf
    • https://jordan.si/dokumenti/file/sirenedujisebevexa.pdf
    • http://www.s4b.nl/upload/files/13274941256.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/zexuselavitadefaket.pdf
    • http://registermycompany.in/admin/userfiles/file/17517312838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+send+contacts+from+one+phone+to+another
    • 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_off0000c97e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 16792 bytes
font_01_sfnt_off0000e195.bin
1b14c9b2c81d9a69c1c03903c3cd15efc6e17215d14f8b80cdfeb13ee06e7561		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 10824 bytes
font_02_sfnt_off0000fa5d.bin
dbc6f5357d014a6930778ebb925af099efc84360762321595e9095ec62db9775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 16536 bytes

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