Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f73a135db43e1…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 05:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c73255766c60853c0d35ac72436f5e5 SHA-1: 4efae307662c07a8983ad9263f87617b78fab112 SHA-256: 940f73a135db43e145e32bec9cb7074deb5ab0495dc6e1abc41ca2582367c2bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and CDN domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=digiland+tablet+manual
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/bijobeki.pdf
    • https://wazexexa.weebly.com/uploads/1/3/5/3/135305699/pirodulosexo_xotikidegomi_lajakaxawowobi_tukaviritu.pdf
    • https://cdn.sqhk.co/memenewo/aG2ge3t/bubble_tea_recipe_taro.pdf
    • https://cdn.sqhk.co/dixejetafap/Y8agiZQ/60013994617.pdf
    • https://cdn.sqhk.co/basinasedu/gcahccl/valopepakiweve.pdf
    • http://normal-id.com/psychology_in_modules_11th_edition_freeudsvq.pdf
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/2190378.pdf
    • https://bifupepazabar.weebly.com/uploads/1/3/4/7/134740405/2863270.pdf
    • http://mkr-olimp.info/785522116269a3du.pdf
    • https://cdn.sqhk.co/rumobotituda/8hdwtQe/reflective_practice_template_rcpsych.pdf
    • http://yesstore.pro/pathfinder_pawns_ruins_of_azlant_pawn_collectionwg50o.pdf
    • https://cdn.sqhk.co/jepogedofuz/2hh9ggy/jutewi.pdf
    • https://cdn.sqhk.co/towevefizub/hdifhjX/football_prediction_application.pdf
    • https://cdn.sqhk.co/fekebazi/haNaUu3/neon_pokemon_wallpaper_hd_phone.pdf
    • https://rorobobadewa.weebly.com/uploads/1/3/1/1/131164171/mowezola.pdf
    • http://vannabanyavsedela.xyz/xamapitijasagafijiwale6zkwo.pdf
    • https://cdn.sqhk.co/wadebekop/ihdqjbt/51869680452.pdf
    • https://cdn.sqhk.co/lewiwifo/ehaTwDi/toca_life_coloring_by_numbers.pdf
    • http://trysoda.club/56777532605kydd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/15cc2802-c5fc-430b-a001-bed5ac4e0491/49443878242.pdf
    • https://uploads.strikinglycdn.com/files/d81bc3fe-0762-4cca-a0be-e107110ea7e6/58350909225.pdf
    • https://uploads.strikinglycdn.com/files/9cb02338-745f-41f1-b419-bfbb87f4e4dd/16415257529.pdf
    • 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_off0000eceb.bin
d1b6c1d73e6bdd6fc106bfa933136911a81e07af071887d281031af87a5b59f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 5012 bytes
font_01_sfnt_off0000fde9.bin
aa576901f48fdfff00a7840b1e5898f578fead68b8e4efd6990b996e5151940d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 11120 bytes

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