Malicious PDF — malware analysis report

Static analysis result for SHA-256 7658f3e8798d179d…

MALICIOUS

PDF

79.2 KB Created: 2021-04-19 19:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01026c233cfa6f5d1af21158986d1265 SHA-1: 757c4ab672c811aefd5a7d07f42792be2971344d SHA-256: 7658f3e8798d179d11edb3d8f70abbf4c7e74987e817a77de7b3722f16e10a87
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'sketchup pro 2015 crack free download', suggesting a lure for pirated software. An external URI pointing to 'jacksth.ru' was extracted, likely serving as the download source for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=sketchup+pro+2015+crack+free+download+32+bit
    • https://static.s123-cdn-static.com/uploads/4445114/normal_5ff368afc5a4e.pdf
    • http://help-lnstagramcopyrights-verify.com/rovekirexerumazuruburame46n42.pdf
    • https://cdn.sqhk.co/rularijulen/ieLjAhi/international_kangaroo_linguistic_contest_2018_answer_key.pdf
    • http://zumepelilebatu.22web.org/sazipiwobezujen.pdf
    • http://melifalafijuz.22web.org/zadowesuzegejinubuk.pdf
    • https://cdn.sqhk.co/kerutadit/igDVhdL/gumizerobejibuborede.pdf
    • https://cdn.sqhk.co/febapaji/cqrjha1/karusilaxibedisojekat.pdf
    • https://cdn.sqhk.co/nivopekodi/ivjdhg5/jekebavuta.pdf
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600bd579deb18.pdf
    • http://visiblawty.com/samsung_nx_nx1000_reviewi90wn.pdf
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fdf58ddcae45.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_5fe70af62a605.pdf
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600c9f49cc96c.pdf
    • https://cdn.sqhk.co/bojowagawire/1hgdjfc/business_analysis_certification_for_beginners.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_12a5a2cd486d4b3f935956bac2c52b9d.pdf?index=true
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_cd2e6a687fcc423ab9ccbc717d4b8d2f.pdf?index=true
    • https://s3.amazonaws.com/vetamedisoz/car_racing_game_apk4now.pdf
    • http://wulumafagupiw.rf.gd/whatsapp_messenger_2018_apk.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_cfe49736a383442ead872e2c7ff7960e.pdf?index=true
    • https://s3.amazonaws.com/savukojubusum/msvcp140._dll_windows_10_64_bit.pdf
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_425070d1e291459baf9bd09b75beba8f.pdf?index=true
    • https://s3.amazonaws.com/sezebepit/firmenich_international_sa_annual_report.pdf
    • https://s3.amazonaws.com/xetasif/valikanatabonexavipilak.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_off0000f501.bin
15a335baa3d90fe043aaef7824fcf4ad6e09c4c022a45e2b5b5cf9b533ca2ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 6080 bytes
font_01_sfnt_off000109c4.bin
ac712cce1c600f62ebb7d46a090d82c0b9790e196a462ac003b44821b17b5535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 11004 bytes

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