Malicious PDF — malware analysis report

Static analysis result for SHA-256 1440e21af01bc87a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-08 15:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1731603a16a8379b31ae81010a33209a SHA-1: 76813e2a4da23960186bb6e461871ec834b304bc SHA-256: 1440e21af01bc87a398af9f5672aca9e8963e1da603ee1cd70a6a83ee3851429
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. The document body, though partially corrupted, suggests a lure related to HIV/AIDS, while numerous external links are embedded, including one pointing to 'vilenefex.ru'. The presence of a large number of external links, many with numeric or keyword-based slugs, indicates a potential SEO poisoning or link farm strategy to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=causes+and+prevention+of+hiv+aids+pdf
    • https://cdn.sqhk.co/bodujemep/e2Njgid/one_bottle_dj_song.pdf
    • https://cdn.sqhk.co/labifikup/MjahjpF/neighbors_place_food_pantry_hours.pdf
    • https://cdn.sqhk.co/mopijiluxu/kgfzjix/drifters_anime_season_2_2019.pdf
    • https://cdn.sqhk.co/sedasolegov/TUYBeif/fofujunabige.pdf
    • https://static.s123-cdn-static.com/uploads/4378599/normal_5fefd458f0956.pdf
    • https://cdn.sqhk.co/liminekaj/drijXgg/90219911070.pdf
    • https://cdn.sqhk.co/zosikoto/8o59Uid/cantaloupe_island_bass_line.pdf
    • http://kuroramogesok.iblogger.org/falonuginofidezerukuj.pdf
    • https://cdn.sqhk.co/zowolanazew/fiahhjj/toy_blast_trucchi_apple.pdf
    • https://cdn.sqhk.co/karadirimose/jY40ipl/drift_trike_for_sale_motorized.pdf
    • https://cdn.sqhk.co/linotepibubi/iAMHhgs/zelozusulizosif.pdf
    • https://cdn-cms.f-static.net/uploads/4464302/normal_6026e3b2bc211.pdf
    • https://cdn-cms.f-static.net/uploads/4415769/normal_5fd2579f0ee35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://susofukezozuwuj.epizy.com/60305182090.pdf
    • http://fukemasun.epizy.com/recent_books_and_authors_2018.pdf
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_ac10551704b44862be5a8e550f528010.pdf?index=true
    • https://s3.amazonaws.com/dosalapasenow/gubodoleradamuxegunotezom.pdf
    • https://s3.amazonaws.com/rodakarugupoko/garorizanamitulikoval.pdf
    • https://s3.amazonaws.com/dezajok/plaskolite_black_corrugated_plastic_sheet.pdf
    • http://jixenefotudak.epizy.com/django_admin_custom_view_template.pdf
    • http://vinegufoxa.rf.gd/85297020947.pdf
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_483a4d80db6c4aed889db78dca2d93a4.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_27a095528ba64db39cce5a967b733b83.pdf?index=true
    • https://s3.amazonaws.com/loranoduzuja/57393986642.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_off0000e695.bin
d85ae8b8829870e775ada71e3e249f46b6d5c470b6ccafcea2ede3dc21fdbc80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 5060 bytes
font_01_sfnt_off0000f7c9.bin
5f382a31340781a56460735bd46087b5b83d4c25534b3f331a2168489678d5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10304 bytes

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