Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be4bca973d43731…

MALICIOUS

PDF

80.6 KB Created: 2021-10-12 06:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 57cd1cfd1b0425c54abb40d97334b7de SHA-1: c02ef97c7b8702179074f55d5f7f0a5a03e0cc66 SHA-256: 9be4bca973d43731a3db59351be6f1704a7c3b4457ec93bd494952d4c2fdfe99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, consistent with a link farm designed to lure users to malicious content or phishing pages. The authoring application 'wkhtmltopdf' suggests the PDF may have been generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://krisoc.ru/uplcv?utm_term=faithful+and+virtuous+night+review PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7e3ae24fd---kejesesonep.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/90967309701.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/26966124455.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/11725137770.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/95263407164.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210919_119EFCEBE198E40E.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/kugogozuje.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/21690465796.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/29692315759.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/81285623377.pdfIn PDF document text
    • http://egitara.com/upfiles/files/29685378357.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/18975026118.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/15786685246.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/busulujenolorefeji.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/41422861342.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/volunow.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/munidepogeluleku.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/22718528590.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/tizakumitulufobimeves.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/dikat.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/53471289392.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/45ccabf8d4e5a6853470f1c0cb7974fc/22947163224.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_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 10860 bytes
SHA-256: c629e17fe72fc699b5e8c9e4d9b05811e50330e413151f4f7b333a4180aac3a0
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 18364 bytes
SHA-256: 14c0c010e530b52246795e49c4f535d87ef7ecc9dcb909a3e8e15f4f7b7b395c

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