Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3807b173015eb3c…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 04:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b0778ac085f42284c2558df21de2d42 SHA-1: 1f617d492e796491cadd206fb8f96ff8fa3ac3b6 SHA-256: c3807b173015eb3c573011ac0f443e5a35c98d4bc3ba01967db17e7a128e823b
96 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL pointing to 'pelibifir.ru', which is likely a phishing site. The PDF structure and embedded content suggest an attempt to trick the user into visiting this external resource, potentially for credential harvesting or malware distribution. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly indicate a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://pelibifir.ru/123?utm_term=android+ndk+log-+lib
    • http://lady-bug.club/roomba_980_black_friday_dealspmbuj.pdf
    • http://getdouche.xyz/68723594935mvhey.pdf
    • http://businesshelpservice.com/jegelabutedupodiyawpk.pdf
    • http://remont-pc.website/91978002448fvqu5.pdf
    • https://cdn.sqhk.co/bugolajoxodu/iBk6Cid/shuddering_meaning_in_tagalog.pdf
    • https://cdn-cms.f-static.net/uploads/4466664/normal_6009f5761e3ca.pdf
    • https://cdn.sqhk.co/wabasenenem/eEfjgjj/amazing_facts_doug_batchelor.pdf
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd2ae2e78fec.pdf
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5fcd6066a8154.pdf
    • https://cdn.sqhk.co/gijimexuv/jvhbgdI/1942_mobile_mod_apk_games.pdf
    • https://cdn.sqhk.co/bofilewidil/9ghFjjc/ama_motorcycle_racing_2019.pdf
    • https://cdn.sqhk.co/tajalawad/egekJG2/17269912490.pdf
    • http://sodaapp.pro/3d_games_for_android_2._2._2xcost.pdf
    • http://air-calm2.club/splash_screen_android_library9yzlc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_f196dbde6c4f4ab7aa8567a80d5ee2f2.pdf?index=true
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_c4eb9250db8f4e6daa8d58af48049a1d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85d8f5dc-8a43-40e3-99b0-0aec7a3a6620/36888897257.pdf
    • https://uploads.strikinglycdn.com/files/236a0715-c6e0-437a-9cde-8cbbe3265736/how_to_make_shadow_puppets_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/6359d387-689b-4410-9f77-6b6e6b23631a/roland_aira_tr8_drum_machine.pdf
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_447bcea440704804bc42f6a1f5610a3f.pdf?index=true
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_b75b8f9a087b41ad8e03c8acede9f49c.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_6aa206422cad4ebdb604678efcf21b58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8aa705f2-de1d-4855-b3bd-8df3d928a88b/55151430871.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_off0000ff8b.bin
5d54283febfe818736e0aa38a7cb3a17babf024f1b4140bea8de6592383aef9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 4828 bytes
font_01_sfnt_off00011010.bin
dc5228d3930c5348c47e0fa084b959216de039c14eeef6e00d8f92cf70b0bc99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11010 11744 bytes

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