Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac76e7b3d59519c…

MALICIOUS

PDF

71.6 KB Created: 2021-02-17 04:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ddd37c94717ea0b89657f13ec5b0631f SHA-1: dbcc73e71b93b258764d14350d0d3e8463ec26ea SHA-256: fac76e7b3d59519c96e14df1e96f8b9a2645865c86653463f777956d4e01c2c2
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating external URI usage and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, 'https://jacksth.ru/123?utm_term=how+to+refill+ink+cartridge+epson+220', suggests a phishing lure related to printer maintenance. Although no scripts were explicitly extracted, the PDF structure and the nature of the detected threat point towards a malicious document designed to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=how+to+refill+ink+cartridge+epson+220 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446270/normal_60109303dfec7.pdfIn PDF document text
    • http://lessonsonline.site/lasufabexerosdq3qv.pdfIn PDF document text
    • http://egrn-order.online/piada_de_ary_toledo_como_ou_elefantet56au.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/BDjhQie/canon_camera_connect_download_video.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwejujorod/jlhf6jd/mini_me_games_production.pdfIn PDF document text
    • http://vashobereg.com/mupekurexifizi80nde.pdfIn PDF document text
    • http://fuckfrsky.com/chess_coach_appjodhk.pdfIn PDF document text
    • http://stc-l.ru/15998667529nebmi.pdfIn PDF document text
    • https://cdn.sqhk.co/linewebozid/cijoEgj/company_of_heroes_3_pacific.pdfIn PDF document text
    • http://shoppingyxplus.xyz/effects_of_japanese_colonization_in_koreaz680s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_6021c87dce56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fe613bb20a7c.pdfIn PDF document text
    • http://mishgen.com/bufferedreader_read_vs_readline_performancerjwwa.pdfIn PDF document text
    • http://pihodze.com/37181822938e9ozw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410216/normal_5ff146d05d466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/nonokinesumosuvojikoja.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/rotapisikigokibopina.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/washing_powder_nirma_assamese_dj_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/mood_and_tone_in_poetry_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/exercice_d_amortissement_dgressif_avec_corrig.pdfIn 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_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 5712 bytes
SHA-256: 84d9a3a2a9757f721229dc66bae5329031f2674df5c69e332a664a8a37277688
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10540 bytes
SHA-256: acd8df5cb49d7cee04208f46e4ab2fec86545c75a4f2607b535b647de39c41b6

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