Malicious PDF — malware analysis report

Static analysis result for SHA-256 35917a2482a44c8d…

MALICIOUS

PDF

79.8 KB Created: 2021-05-04 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e89c6ad876864dc1005b5356f8a23f SHA-1: ba929d704c76fe90250dbff65b169694d0eb62cd SHA-256: 35917a2482a44c8da33a5873310e83830009f9a013eb5f6f0b88f16e7c197dbd
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is a strong indicator of malicious intent. ClamAV detection and ML classification further support this assessment. The document body, though heavily obfuscated, appears to be a lure related to 'data structures for coding interviews', suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=data+structures+for+coding+interviews+pdf
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6046c76034b55.pdf
    • http://kelnoteres.xyz/40566411742giqkx.pdf
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff46552edf6d.pdf
    • https://cdn-cms.f-static.net/uploads/4471083/normal_6041933cba3f6.pdf
    • https://cdn.sqhk.co/zijigemeworu/hgMtijt/bluetooth_speaker_amazon_best_sellers.pdf
    • https://cdn.sqhk.co/xudadidi/1igjagg/castle_artillery_mission_fallout_4.pdf
    • https://static.s123-cdn-static.com/uploads/4384649/normal_6000b42c5e4f4.pdf
    • https://cdn.sqhk.co/fupupusamun/fidugyN/53095486347.pdf
    • http://creditreportusa.info/jokekuxipurosenuririlajoz23qt7.pdf
    • http://onlyforyou.space/bullet_to_kill_elephantqwl85.pdf
    • https://cdn-cms.f-static.net/uploads/4468540/normal_6034979cacaf2.pdf
    • https://static.s123-cdn-static.com/uploads/4470981/normal_5ffe2814c4d4f.pdf
    • https://cdn-cms.f-static.net/uploads/4425227/normal_60420a58ce2f8.pdf
    • http://lesantyqas.online/vedisolidetem4xdco.pdf
    • https://cdn.sqhk.co/tatomaxeriri/Vjapd8I/allan_poe_cuentos.pdf
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5ff5c73273de9.pdf
    • https://cdn-cms.f-static.net/uploads/4423189/normal_606696ee225ff.pdf
    • https://cdn.sqhk.co/kulobuwaxegu/ejfhivc/find_friends_app_iphone_update.pdf
    • http://predouche.xyz/www.perfect-english-grammar.com_present_continuous_exercisefr1ky.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5b5d15c8-2539-44b3-9fd9-239ff75a0360/defukobuxapobex.pdf
    • https://uploads.strikinglycdn.com/files/61dd6961-ef0f-464e-a9c6-58ddb623aa3d/health_and_safety_policy_for_small_construction_company.pdf
    • https://uploads.strikinglycdn.com/files/83fe2f08-bc71-489c-a13b-bdc28d555332/rhetorical_grammar_7th_edition_answer_key.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_off0000f756.bin
e38e32a7c61d5b85da50ee36c27afb8c7ee06d6d49f451fce043d74bcf603ef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 5444 bytes
font_01_sfnt_off00010a0a.bin
d1ad7ac82c9d35df1499cdeb6ca2eb490f2754431648436a6a90129dad82b734		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 11024 bytes

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