Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8e9c94a0186404…

MALICIOUS

PDF

73.7 KB Created: 2021-02-20 18:22:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84f3a1a3368cbdbe28bcb96f9a9d411e SHA-1: 24df64d461636d6501849647b5a58f58692741df SHA-256: ac8e9c94a01864040835e935975ba3000b8b70954fa0351f87385229aa3ac6be
184 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to popular online games. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=what+is+the+least+expensive+dominus+in+roblox In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_602371f12039d.pdfIn PDF document text
    • http://ita-bio.fun/classement_coupe_du_monde_rugby_2019qzg8m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367912/normal_5fcebf0b72b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/IWMjihb/macao_casino_fish_slots_on_facebook.pdfIn PDF document text
    • http://bred-enligne.com/58437670497jlaql.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_601865054c8ce.pdfIn PDF document text
    • http://shoes-storie.club/82269691716fo8rj.pdfIn PDF document text
    • http://profapp.pro/chemistry_class_12_notes4yjic.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/Fjjcmhd/naruto_shippuden_ultimate_ninja_blazing_english_apk.pdfIn PDF document text
    • http://sacredname.ru/aprender_a_tocar_guitarra_electricaflurc.pdfIn PDF document text
    • http://hdsamara.ru/logo_quiz_answers_level_77mc54w.pdfIn PDF document text
    • http://lnstagram-helping.live/mitsubishi_mr._slim_maintenance_manual2vbsk.pdfIn PDF document text
    • http://maddot.space/banner_background_images_hd_free9708v.pdfIn PDF document text
    • http://true-board1.club/neighbors_2_sorority_rising_castfzpoy.pdfIn PDF document text
    • http://pay-order.info/44377667200zh4y7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_6014694e1b699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bokofapig/pearson_american_history_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/vunuwukijivemugi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 5364 bytes
SHA-256: ad059be6360d9e91ac6fbf1d32dd2a5314b4c6434f2667888d4a5d1e91e9200d
font_01_sfnt_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 9984 bytes
SHA-256: a147edd51c507f82f9480f90f39b736eed16d04e21cc2b3c495df67da8b08e8f
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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