Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8083eb928501ed8…

MALICIOUS

PDF

85.0 KB Created: 2021-02-09 02:34:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 94cacfa65b13082cb7d60c4cedd0dfd0 SHA-1: 1bf11563ae79e52bd341a8d6ff80ab1cf12cfc05 SHA-256: f8083eb928501ed8b0588cb1d41c87c809995d982346cc74c0f5d9beeb07949f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=osrs+dragon+slayer+2+low+level+guide PDF link annotation
    • https://cdn.sqhk.co/bugininaxi/AcjbROJ/80963706661.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/jdujd7R/34149908877.pdfIn PDF document text
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/530801.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/mawatuw-nadajefu-padovawi-gemeganonuxata.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/Fe8jgpF/nadiwigoma.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/fed3a8c7d.pdfIn PDF document text
    • https://guvatezip.weebly.com/uploads/1/3/0/7/130776756/rewozi.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/gefuwusapes-zoxajutov-jikevamafonunu.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/b76164c9543.pdfIn PDF document text
    • https://jurozujuzofu.weebly.com/uploads/1/3/4/8/134875655/pelinunolatu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/VEVewia/world_history_world_war_2_test_answers.pdfIn PDF document text
    • http://mazafaka69pussy.online/health_assessment_in_nursing_6th_editionxg4to.pdfIn PDF document text
    • http://merovew.xyz/trailer_standard_repair_timesb5nsj.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/fifavuniroro_xoboxola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/at_last_saxophone_sheet_music.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 5408 bytes
SHA-256: 873b205b4b0a93d7b72f2aaa3963073be49e43812c650924bf8fb17895011b76
font_01_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 10816 bytes
SHA-256: 3bbfbbc75c63110415658c786285a67016febad3660334920d9e4c67077e8d4f

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