Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef0e5e6c09fbab0…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 12:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c336b2036dcbed91de08ab83752653dc SHA-1: aec12f54455eab9a326cddcb1b9ea660b2f8c5c4 SHA-256: 2ef0e5e6c09fbab086ed4596ff927aff88dbf808a7b4fbe49521bf485a722117
184 Risk Score

Malware Insights

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

The PDF contains embedded links to malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to a 'guide pdf', which is consistent with phishing or malware distribution tactics.

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=greed+for+glory+guide+pdf In PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jdjeX0N/88984256530.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/djiipie/69951637168.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/ahdjilr/itel_mobile_dialer_express_recharge.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/ramas_de_la_arteria_carotida_externa.pdfIn PDF document text
    • http://labiluwewinedu.22web.org/kilawejozedelazapalajedux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60199e0052bdf.pdfIn PDF document text
    • http://rebituzugofebo.22web.org/analitika_geometrija_u_ravni_formule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fd17d6424b64.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/2Pid6gf/stick_shadow_war_fight_mod_apk_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35b9997-9c92-4df7-a044-e0a80790581a/48461361877.pdfIn PDF document text
    • http://vegiroromofi.rf.gd/buoyant_force_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e05ff1-49f0-4e87-aab8-468339d4485b/dance_music_80s_songs.pdfIn PDF document text
    • http://xamunenefo.rf.gd/34043518473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbd5012-44e3-4814-accd-9028d406352c/21053514426.pdfIn PDF document text
    • http://susabumo.atwebpages.com/2330527955.pdfIn PDF document text
    • http://fefuwosijar.rf.gd/hp_deskjet_9800_driver_windows_8.1_64_bit.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_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 4952 bytes
SHA-256: 64eb595b28f56db4bb9fab30212ab2dca1eccffab44b640eff9b8b39cbdb57ff
font_01_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 11480 bytes
SHA-256: b25fa9bbcecca0f4425fb2673c96afbcdd1ec83ced60ad05b9d30357bc692349

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