Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15aa6cca06c3eab…

MALICIOUS

PDF

115.0 KB Created: 2021-09-23 21:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f031dbe8e11456d468c5978179e15039 SHA-1: d4227dddc0652d14df488a55dc33337786775f3d SHA-256: b15aa6cca06c3eab406b2f5e7fad58c4f126205db934c1ce76a3b2b91e658d06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webornate.com/viking1/uploads/files/6165281197.pdf In PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/luwibugesimazivudisigar.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/vimuzijerujitajifufi.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d866257311---57648273705.pdfIn PDF document text
    • https://naves.cz/res/file/51233927630.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/11668535157.pdfIn PDF document text
    • http://chiuman-hk.com/images/file/73551166555.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/tuwurumefeladanelas.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/weluf.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/86540225560.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/80621874667.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/kuzosevakamedurubewe.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/xawijixutezukan.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161493a52a738f---befikiso.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lugomewaxidamiwevesusix.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa6b7e1f8---17539599972.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/94933939719.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/18161582771.pdfIn PDF document text
    • https://activepymes.com/pub/file/xetaketane.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/19408535137.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/tujokasumifesawifamoxu.pdfIn PDF document text
    • http://conkheror.com/ckfinder/userfiles/files/xexuxe.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/wosez.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630517542.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/48200367577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=123+movies+spiderman+2PDF link annotation
    • 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_off00015b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B79 19004 bytes
SHA-256: 8a96c50ec98db04504f541ed877655c71569f731b4b630c7f7a54bf18e5de2dd
font_01_sfnt_off00018d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8C 10724 bytes
SHA-256: 3e85d1e6a4d01348199bb260520fc1570bef11f16345963edefef082a4a8cd02
font_02_sfnt_off0001a636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1