Malicious PDF — malware analysis report

Static analysis result for SHA-256 9140f3026d0d5eb7…

MALICIOUS

PDF

79.3 KB Created: 2021-02-19 14:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1e773c4031d12848c51498099047dc45 SHA-1: 9342ea26f7776c281d1bf49d5b8f5507b2c4a312 SHA-256: 9140f3026d0d5eb7e06f87be1a1ed1900e771145eae5cd3f37be285c7636bbe4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm designed to obscure the true destination. The document body, though heavily obfuscated, contains references to software and games, suggesting a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=adobe+photoshop+cc+classroom+in+a+book+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/gulanuwe/hhgcged/tiktok_video_no_watermark_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/YLjbMmu/anime_face_generator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/JsDhhPc/lemon_cake_with_raspberry_jam_filling.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/G1haAN2/rum_balls_all_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/1YVgfje/98108048322.pdfIn PDF document text
    • http://nosukave.22web.org/xitewabexawifogeto.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/tsphbhb/indoor_3d_archery_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/DibxUhf/15094325393.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://datidogebe.epizy.com/angel_of_death_game_free.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/application_tracking_system.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/bangla_typing_master_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/38950274218.pdfIn PDF document text
    • http://wafazitowem.rf.gd/yahoo_mail_change_password_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/fogofinelifanami.pdfIn PDF document text
    • http://renisibupo.rf.gd/gutonox.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/37071706418.pdfIn PDF document text
    • http://zugugizifozuwor.epizy.com/feluvomakalik.pdfIn PDF document text
    • http://damatagowigiz.epizy.com/zolix.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/vekagos.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/44345968582.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_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 5864 bytes
SHA-256: 8a7150f061a22432827d373ac2fbb49f47557d12b16abab8c09b6c0c3b120b62
font_01_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 10492 bytes
SHA-256: 9642bc6dd7fd309e653fea2516337d6bacab55aae568784ccd2f3177788584b7

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