Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a22a8b7fcd48803…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 06:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bf797b35209cdd4fea268cfe816a6474 SHA-1: 64e9e31acfe72138d3cadb69af92dc56cab9d30c SHA-256: 4a22a8b7fcd48803df57ac1879df7c472e85cf6ed233171222f0cb14df0b03a3
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains an external URI pointing to 'jottigo.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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://jottigo.ru/123?utm_term=a+concise+introduction+to+logic+answer+key+chapter+5 PDF link annotation
    • https://cdn.sqhk.co/gesokusa/f683jfH/planet_jump_spaceship_arcade_games.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/zgdGbge/wujijerixetubudejene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_602dea339b25e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fe1b204ef0f3.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/new_york_dma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_60317ac3b50de.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/what_stores_will_refill_ink_cartridges.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/hiEjhiP/99473569112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_602039472e83f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mesotodimus/majesty_violin_sheet_music.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/amar_chitra_katha_mahabharata.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/bts_song_musicpleer.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/xesofobunositarumusibibok.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/mentoring_interview_questions_and_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 5588 bytes
SHA-256: 8e7e6057ebe45dd37268bb76541735b0d1e775e71386fa95ccccaa329d1adbab
font_01_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 10344 bytes
SHA-256: 9a9451ca24e7de4bdfefbf8cfbbcb96b39007be30120e70030ab56f7bfc09f85
font_02_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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