Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b402b53c00ee293…

MALICIOUS

PDF

67.4 KB Created: 2021-10-03 00:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01ca5dfbdfa67832c528e6b8ea86daec SHA-1: 3b17b51b0c7290f1d75a6d1f6d7f8f25245c8d05 SHA-256: 7b402b53c00ee29337ae68c83a18b13d5aa1e65f0bff6f9ca54dc689116651c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=gin+and+seltzer+calories PDF link annotation
    • http://signauction.net/userfiles/file/dixozag.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8211ab241e8802adc8f4298228b08512/lifanot.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/vezebirez.pdfIn PDF document text
    • http://kodemari.info/data/files/34630451578.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/9451235949.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/81638648453.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bslut3m4a0k11a65ds9tk090n2/mavizezeribirabofu.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109030337572153.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/22574218402.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/ronebusevutovove.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/wepekuvapakori.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/83939603665.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/bupezedenikupuke.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28654050736.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/3534467079.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/44806469083.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/35962603048.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/1696200578.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/bewasefizikuresanalevukuz.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/biluxibosuf.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/60305998847.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_off0000ab7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7F 14764 bytes
SHA-256: 3ba9944063dc879c349209e94c42013cda8d71160c7d0c1e05dc8fa2811f416b
font_01_sfnt_off0000d08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 10460 bytes
SHA-256: b7075610de7d59469e81d12a39a854e3d5d920a2f9258e5e0c315ba3b7714c33