Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f4960b7a8a700e…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 19:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f6956c0f09b1930979693ae8eaae7240 SHA-1: 5d95aa12beeb0549415adc892e680008ea418132 SHA-256: b6f4960b7a8a700e74e81332a6672b6b5e3eb0f950f3a6dc495277d8aa333e85
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings, strongly suggests the document is designed to redirect users to potentially harmful content or facilitate further compromise. The primary attack pattern observed is the creation of a link farm within the PDF.

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://ponafet.ru/123?utm_term=homeland+imdb+episode+guide PDF link annotation
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/perarig.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/dell_optiplex_760_upgrade_cpu.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/cOsihma/knighted_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/vetejevibas/iduhdgj/60729875799.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/sample_essay_questions_for_elementary_students.pdfIn PDF document text
    • https://cdn.sqhk.co/nizudezed/gSieELx/face_mask_sheet_for_dry_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/tisorobew/4jjgcbG/33313037718.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/2dbgdgc/delete_background_apps_iphone_x.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/90446411056.pdfIn PDF document text
    • https://kobadoxe.weebly.com/uploads/1/3/4/3/134310171/a13110eb.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/jeo89jh/torolufitop.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/sMkgdd9/wolusosanirokivusuwabali.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/cny3Uhg/16039128481.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/2375243.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/NAgijip/crossy_road_download_pc.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/hillsborough_county_schools_report_card_schedule_2018.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/dosipizolapunomaledopise.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/fajixe/pepco_report_downed_wire.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/bigg_boss_tamil_season_2_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/quotes_about_school_uniforms_being_good.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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 5284 bytes
SHA-256: a73aa39e79f5448f51d77b4251fcdde6ad57457cfd3f208c7d85ccef3dba21db
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10916 bytes
SHA-256: 83ba07ab6a0a07a32a85266e3205248483938c097cb16477f611c30e86397c68

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