Malicious PDF — malware analysis report

Static analysis result for SHA-256 62015b07fd04de1e…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 14:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 41637c36b02c1f1ac5745b324767324a SHA-1: 91cf5f3220fa670eaefe1c859ebd2bccd432d54e SHA-256: 62015b07fd04de1e6640075573390b4d5afa7c4cfe9a26931ce60a3e50c5bb2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, https://nipisod.ru/award?keyword=patofisiologi+orchitis+pdf, suggests a potential phishing or spamming operation disguised as legitimate content. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://nipisod.ru/award?keyword=patofisiologi+orchitis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fe7301fd11d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_601bd00317ac9.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifx1oCW/ramp_car_stunt_game_video.pdfIn PDF document text
    • https://latuguno.weebly.com/uploads/1/3/1/6/131606113/nilazewilusoba.pdfIn PDF document text
    • https://cdn.sqhk.co/fusureviweki/ojjg5ic/majority_report_twitch_tv.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/d9ea8639860e.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/eggfWjj/60443306700.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/6856228.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/fvLgjih/49354506310.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/gjjhdPr/simcity_buildit_cheat_codes_no_survey.pdfIn PDF document text
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/8945819.pdfIn PDF document text
    • https://mofegagopabelem.weebly.com/uploads/1/3/1/4/131438130/9630561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_1a3db91892384361bb08d933ec5c87ac.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_9602152a031d45b987eb2c314854e43f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/options_trading_for_book.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/62519572522.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/upsc_exam_calendar_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/business_informatics_msc.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_c02fa6dadf9547f4965090bab3fa735d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/auto_voice_recorder_app_for_android.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_39c7660c478e405c9985f71b9ce868d8.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_6896fa342f9344db88228a0e962b382f.pdf?index=trueIn 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 5420 bytes
SHA-256: f79c1fd4f79958f705be112b260a81b52c1bb3e88842d38e21ebea2b45d8b268
font_01_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 10316 bytes
SHA-256: 768273cd318220bdd9a6595c568ed235a054fb626b12af5f45145d92a3ba4881

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