Malicious PDF — malware analysis report

Static analysis result for SHA-256 b976174f1231e631…

MALICIOUS

PDF

69.4 KB Created: 2021-02-08 01:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b15fe779a144092e055b9e843f4faeb SHA-1: d9ba1c542a4c76ef5129f60a42885323481c749f SHA-256: b976174f1231e631077cd1e32eb1abaedd369349fdea61d845f774913e308d3a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URIs pointing to disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of external links suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://seumenha.ru/123?utm_term=linn+mar+high+school+volleyball PDF link annotation
    • https://cdn.sqhk.co/ligumorik/ijhfkgf/68784765249.pdfIn PDF document text
    • https://xuxufidumexed.weebly.com/uploads/1/3/2/6/132681394/908071.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/jgCyHja/good_old_dungeon_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/cKWcgkM/richest_football_club_in_uk_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gfWGhNR/xabuj.pdfIn PDF document text
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/65face3670d726.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/ihehccD/dhoom_machao_dhoom_star_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5fd5f1fce9943.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dnhLM81/sewopo.pdfIn PDF document text
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/kuvup-bamukekevemul.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/ijDPfa9/droid_factory_galaxy_of_heroes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuwepowav.epizy.com/outlook_calendar_template_for_excel.pdfIn PDF document text
    • http://wojudor.epizy.com/digestion_perfecta_deepak_chopra.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/julegomijemak.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/evaluating_expressions_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/the_odyssey_emily_wilson.pdfIn PDF document text
    • http://medojowibapij.epizy.com/attitude_bhaigiri_status_video.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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 5456 bytes
SHA-256: 822104ff8d23fd2cb9bc5f8d181896586a6ba22b335ac7e0bfb2e75735d0ebdd
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 10376 bytes
SHA-256: fee8ab3687ffd9ed592887228aacaca4b816507a5749ddcff9f65ffb2e9277fc

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