Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a138c4bbf3fe2dd…

MALICIOUS

PDF

82.2 KB Created: 2021-05-28 21:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4bfeec1762a3d864367fb56c744d0780 SHA-1: 3cbae9b70e683fdcc278628bf9bbd2cc1556d0a4 SHA-256: 7a138c4bbf3fe2dd2bdd56cd5abd850455de618f8f48b964fbbed0a44574dd61
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a malicious intent to distribute content or redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/123?utm_term=industrial+attachment+report+doc PDF link annotation
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/2183232.pdfIn PDF document text
    • https://jevijoju.weebly.com/uploads/1/3/5/9/135978445/fefonirinew.pdfIn PDF document text
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/9588589.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/99b09a5b6889c.pdfIn PDF document text
    • https://wupugilitem.weebly.com/uploads/1/3/6/0/136020535/1981365.pdfIn PDF document text
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/8028062c29.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/gajawigigafok-gebikawu-guzositop-rolanu.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/senejozafuwefo-sefozodob.pdfIn PDF document text
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/novuzo_somomobuz.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/rasoxipokifiza.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/3858398.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/vizisemeten.pdfIn PDF document text
    • https://vuvitujenus.weebly.com/uploads/1/3/4/3/134305132/dutefeluvokiwod-sopekefunit.pdfIn PDF document text
    • https://jefiwosu.weebly.com/uploads/1/3/1/3/131379536/66ad8dc52198.pdfIn PDF document text
    • https://xolopebowuraj.weebly.com/uploads/1/3/4/6/134600193/zoziwewawil-rajij-lizudatiralo.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/1110f02b0a227e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489722/normal_6048c119582ac.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/ae3ffb72bdb6365.pdfIn PDF document text
    • https://bemilinup.weebly.com/uploads/1/3/4/3/134390274/sobumedasidebo_gugefo_kodotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_5fd8145420892.pdfIn PDF document text
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/7b50a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 3588 bytes
SHA-256: bd2d995087c04304d1a2baf24dc51b591f3a7fdcd319f9c6f7e599bd9b1739e5
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5248 bytes
SHA-256: 90b2264f05dd30fc1f57c51ba7b7f8842938031ea0218d589cea6a7118eeb31a
font_02_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 11600 bytes
SHA-256: 1dc5a33def2d434a271fed6213912b572245f11a22100eb9a499806e57f7040c