Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a7f0bb840630d…

MALICIOUS

PDF

76.4 KB Created: 2021-02-22 19:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a733a632f81d865051affbeb97340b68 SHA-1: 6faf65240ccc5bcf23cd8209b6b11eee36258e9d SHA-256: e54a7f0bb840630d77d9902ecf8df4492c06f76c3726b80de4af75183d7c4a43
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an external URI pointing to 'jottigo.ru', which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, potentially a second-stage download. The document body, though heavily obfuscated, contains text related to teaching English, likely a pretext for the phishing attempt.

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=teaching+english+as+a+second+language+methodology PDF link annotation
    • https://cdn.sqhk.co/zuronenom/hbgh5ii/tikoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_60307b478689d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387417/normal_60025f41a6d92.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/4icDhDV/nuwakimi.pdfIn PDF document text
    • http://store50off.info/noserafejirepukowakawad3rii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_5fd202e6d3701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_6004b7c97d164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410722/normal_5ffd0cc50ed90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_5ff6cf0a94215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fe6342bb533e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478137/normal_5fe1c1fc54858.pdfIn PDF document text
    • http://kefinefure.iblogger.org/76725763054.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
    • http://kubivakov.epizy.com/asuran_movie_ringtones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/recipes_using_crescent_roll_dough_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/angular_formcontrol_get_value_in_html.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/17390291607.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/57976621274.pdfIn PDF document text
    • http://fonunegemo.epizy.com/guide_to_effective_instruction_literacy_4-_6.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/aadhi_bhagavan_tamil_movie.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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 5192 bytes
SHA-256: 8f3fae6172d452666629aa327be3f8f39d86ce36762a2bffa9c58cd58d5128a3
font_01_sfnt_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 11204 bytes
SHA-256: 7ad9a0323020fafc6e74673824129210aa2277769e79cc8c9a84a9bed2666496
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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