Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f91c6d92a4f7efc…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 03:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a5c6078620bfddae1c2c581bfcdb3db SHA-1: 13d7d91854e026218be63d94edcad84b49ace7c0 SHA-256: 0f91c6d92a4f7efca3f3c2b51e7f87f41ccf44d86adc85545af4708162f06bb6
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://leonvi.ru/wix?keyword=picasa+web+albums+rss+code', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the phishing lure. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/wix?keyword=picasa+web+albums+rss+code
    • https://cdn.sqhk.co/girolivudafo/Bhjjegf/54847639905.pdf
    • https://cdn.sqhk.co/noxivudeva/PgSwgjU/72741932379.pdf
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6033ece362cdc.pdf
    • https://cdn-cms.f-static.net/uploads/4458622/normal_6028e43adade5.pdf
    • https://figowemepiwe.weebly.com/uploads/1/3/1/3/131398533/mamepudorimod.pdf
    • https://bazajiwudimikot.weebly.com/uploads/1/3/4/3/134344454/6327489.pdf
    • https://cdn.sqhk.co/vibugilek/hjhieQM/asterisk_13_documentation.pdf
    • https://cdn-cms.f-static.net/uploads/4418788/normal_6021107abbe80.pdf
    • https://cdn.sqhk.co/xokipuxat/hd8hZhJ/51454835990.pdf
    • https://cdn-cms.f-static.net/uploads/4473919/normal_606197907945d.pdf
    • https://cdn.sqhk.co/visipapafef/dhfjihh/guidelines_on_paediatric_parenteral_nutrition_espghan.pdf
    • https://cdn.sqhk.co/nokotadi/igiegdF/wizard_of_oz_witches_names.pdf
    • https://ruzesemuzonasow.weebly.com/uploads/1/3/4/0/134017575/vafekugavusuw.pdf
    • https://cdn.sqhk.co/givesaxi/ovun0he/ulearn_cerner_hamad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xewamejixolefaj/subject_verb_agreement_worksheets_advanced.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_53b64b2a103d4471a9f7567536a4f150.pdf?index=true
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_9aaa0d0792904ba981ec6ec3b4ebd714.pdf?index=true
    • https://fcef513a-4692-48cf-ab01-3d1382c723c9.filesusr.com/ugd/c8683e_565dc75530b04f8cb800b669fe9f2100.pdf?index=true
    • https://s3.amazonaws.com/pesetufavo/how_the_court_system_works.pdf
    • https://s3.amazonaws.com/jezaxojipevu/css_formatter_single_line.pdf
    • https://s3.amazonaws.com/pesetufavo/10750214941.pdf
    • https://s3.amazonaws.com/muvevanepen/space_odyssey_2010.pdf
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_bf250daff8e143ba958200d44a506310.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_1c8fe50509f4483cb2911c74ff410b5b.pdf?index=true
    • 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_off0000f12c.bin
d8cd20abaf6af0c47688075c5c3228a07af736ad9c53ae848dd562fe5e95c381		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5316 bytes
font_01_sfnt_off00010333.bin
19e8234a8f0b960fe41fbeb914977a1a9b505d2e3ecf29bc81d9e34483c4bdc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 14544 bytes

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