Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9028cecbb1dc5e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 881088dece56a4c3db899e7c88b49249 SHA-1: c4d5c64892718b812ad75d941f8e4f4022e2c268 SHA-256: 8a9028cecbb1dc5e37ee1d560c4262ab06a2b44d9a6164655eed706950f41a46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://delaneyllc.com/ckfinder/userfiles/files/87665168934.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/21847651950.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/109125165.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/19564279264.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/sozetakokugeripovaw.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/54097102684.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/wapuzelobulo.pdfIn PDF document text
    • https://12shio1.com/contents/files/xokebisagutazumezonav.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///tifubuxo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0ddce29c0---nefob.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/xabizem.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/wunevudosuwalupuziwom.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/44720164543.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/52986735162.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/kovud.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/96252923498.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/xapojupas.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/loreboxabo.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/68287529142.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/pugozodediv.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/metafagifajoravukexus.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/31848636707.pdfIn PDF document text
    • http://446888.top/userfiles/file/polexokojavutigawefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sat+black+book+pdf+downloadPDF 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_off0000b273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 10512 bytes
SHA-256: f91959101e339254b340aa34ca8af84f6e3dab257edffcd689d3ff6267a1fc4d
font_01_sfnt_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 16488 bytes
SHA-256: 0d7df929412ecf5d32b56f344fc5f1ea9c652e49740a7dcfeaa4cee94cee63fc
font_02_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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