Malicious PDF — malware analysis report

Static analysis result for SHA-256 822d9aa30a3c3cb3…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 02:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8b07be3f74395e596dc2e991ab73db69 SHA-1: 88bcccd7717f067a9fb86e171be43347237aeb2c SHA-256: 822d9aa30a3c3cb378ce82fb3e3fdf3d39f35057c401c9a16587181e477931da
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jottigo.ru', which is presented in a context suggesting job opportunities. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic indicate an attempt to redirect the user to a potentially malicious external resource, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=control+systems+engineering+jobs+uk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fccbe20cc473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481699/normal_600804c715c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_6003b31bed255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381091/normal_5fed5efa38035.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwebukesa.epizy.com/9804685394.pdfIn PDF document text
    • http://ronagonisewa.epizy.com/born_to_race_2011_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/happy_birthday_to_you_viola_sheet_music.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/bedefulolotudizarazi.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/jumusutelixelojedebari.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/52623442266.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/triangle_congruence_proofs_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/star_wars_battlefront_1_2004_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/bloatware_remover_apk_without_root.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5084 bytes
SHA-256: cdef69c02dc0afad93cb387bbc183ed17d34564408925074d03c504268599f26
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 11364 bytes
SHA-256: df70a64583ff467a9f45209334db75bb820cb91e3acde3c8f4a9ad3576de242c

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