Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d517e5a58f240a2…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 07:53:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4acb8cb60ea3ac2ec51ee2e2a61a9ee SHA-1: 7f8d9d45508790cd2b333b015dc37d540e20bbf5 SHA-256: 3d517e5a58f240a2756fbb017a5d8be54411141682aa2a5881df5fce8e01b78f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, indicative of a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL 'https://midufefew.ru/wix?keyword=energy+webquest-+nonrenewable+and+renewable+energy+answers' is a primary indicator of the lure used to direct users to potentially harmful 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-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://midufefew.ru/wix?keyword=energy+webquest-+nonrenewable+and+renewable+energy+answers
    • http://pixelbarista.com/punasemaxidofaveteru60oq6.pdf
    • http://wigomufeze.22web.org/zokedijigixakakoviro.pdf
    • http://kpupnov.pro/ber_guided_math_conference_201885asr.pdf
    • https://cdn.sqhk.co/leporolino/eUc3gib/mofiwaniwonepigenujanag.pdf
    • http://pearhaidhr.fun/21345154898kvynv.pdf
    • http://zumubexupon.22web.org/govuduxatowaka.pdf
    • http://samyog.ru/how_to_repair_a_panasonic_plasma_tv_with_blinking_ledmunnx.pdf
    • https://cdn.sqhk.co/lunapolakezo/iic2djb/yeezy_700_mnvn_black.pdf
    • https://cdn.sqhk.co/rekubapapup/johijbL/95895115634.pdf
    • http://popularchoice.space/who_rules_the_world_documentarypuim0.pdf
    • https://cdn.sqhk.co/moromasi/7jejfgj/33010409281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_c89ea5ecd5f945d482e0f9ddbc76a5c5.pdf?index=true
    • https://cc67bef4-e22e-42fd-bf01-3f02b15f800b.filesusr.com/ugd/080020_c683e1077dc04e5cac0dccb4f354def8.pdf?index=true
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_6dbc2b30c47c4bd7b9d5740ffcf9800f.pdf?index=true
    • http://zenowalu.rf.gd/vigajolizi.pdf
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_208ce2a5932c4bc5adbd28d0604b7ad1.pdf?index=true
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_290fcc3e4e104f6f8005fae41e82141b.pdf?index=true
    • https://s3.amazonaws.com/dixaleko/how_to_find_initial_velocity_with_angle_and_distance.pdf
    • https://s3.amazonaws.com/baxekojojexusol/65384305411.pdf
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_9821504fb9f44a01bcd36b5c32e85f50.pdf?index=true
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_7e33982c473842c7ba0ab196ab311791.pdf?index=true
    • https://s3.amazonaws.com/tixeligufokup/wpf_textbox_binding_string_format.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_98b11d723dd04bc080ca196efe9f5097.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/75441549548.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_off0000db41.bin
5ad5edb48d4d8943f6c9d4bfa8140b0dbc7c86bd72f5ddb2b68716da4a491b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 5440 bytes
font_01_sfnt_off0000ede2.bin
b454a2e6bb7e19dd76385a71686f544798eacb2826841acbacb19d1c73e0145f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10580 bytes

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