Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54d760b9d496640…

MALICIOUS

PDF

98.2 KB Created: 2021-04-07 05:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb75c9f90003cde71680ec5c76717db SHA-1: d4425201341d205934230eb5af4a371f6e719d1f SHA-256: b54d760b9d4966405068c7ad12d5e1bf510371781cfcebe2bd27f36efb0444c4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to a suspicious domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=tipos+de+riesgos+laborales+pdf
    • https://cdn.sqhk.co/rumobotituda/gOhihjY/free_song_ciao_adios_anne_marie.pdf
    • https://cdn.sqhk.co/moviferu/qPjggM4/one_touch_drawing_apk.pdf
    • https://cdn.sqhk.co/liripudeb/IF9Pvjc/jonidufomoloxaxud.pdf
    • https://cdn.sqhk.co/zadoweferoxe/fsys5LT/ufc_card_tonight_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/piradi/how_to_add_options_trading_to_td_ameritrade.pdf
    • https://s3.amazonaws.com/palevijuj/avast_virus_definition_offline.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/92893750868.pdf
    • https://s3.amazonaws.com/dikobepibelun/how_to_reset_brother_hl-2270dw_toner.pdf
    • https://s3.amazonaws.com/fokapikow/64523332303.pdf
    • https://s3.amazonaws.com/gopuze/jejawimalos.pdf
    • https://s3.amazonaws.com/woxewiwupir/84176645401.pdf
    • https://s3.amazonaws.com/votuweroxigezog/sijopajafunovalijufober.pdf
    • https://s3.amazonaws.com/limewub/sitabonutuxores.pdf
    • https://s3.amazonaws.com/domegagowevag/engineering_mechanics_dynamics_9th_edition_meriam.pdf
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_d64f69033940441c93b6b94664d530d3.pdf?index=true
    • https://s3.amazonaws.com/tuxexi/5643418269.pdf
    • https://s3.amazonaws.com/zozofufulolig/standing_waves_physics.pdf
    • https://s3.amazonaws.com/fadedosi/anticoagulation_in_renal_failure_guidelines.pdf
    • https://s3.amazonaws.com/tobovunoberiki/7218769268.pdf
    • https://s3.amazonaws.com/zesotat/credco_instant_merge_credit_report.pdf
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_c5704e7455084e51b8226e31ae48f69e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014005.bin
735bde82996b2a7c9a8cb7201116cca371fc1e08b3c65ee0e8648f0271d81b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 5296 bytes
font_01_sfnt_off0001520b.bin
df55c1a5d9f7989e0ee2ebaa5790bd2cf2dd2c0e15f7bcfba8ca505114ce49d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1520B 12444 bytes

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