Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81dc25a1db11a11…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 18:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ef7750cdb4e58a457ec01f52a2ee9190 SHA-1: 6efb2ad0ea70cf709d1f9312c2248d1ebd845bfb SHA-256: c81dc25a1db11a112f2cb9b76a52d0d738d25b92587e71981a9cc8e2d8d49fad
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 a high risk score. It contains an embedded URL pointing to 'zajinet.ru', which is flagged as suspicious. The PDF structure and embedded content suggest it's designed to trick users into visiting this URL, likely to download further malicious content or phish for information. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=what+is+the+composition+of+a+rock PDF link annotation
    • https://cdn.sqhk.co/jigavozef/cariFia/screen_recorder_free_for_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/wodegamido/fSibiOH/analysis_of_cabinet_battle_1_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/fgbicVE/snapchat_emojis_yellow_heart_to_smiley_face.pdfIn PDF document text
    • http://rasejili.22web.org/5075953220.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/dapapimexunexop.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/jevedijadiki/free_bunco_table_tally_sheets.pdfIn PDF document text
    • http://tepijivazijovij.epizy.com/jezebutenilebekupenu.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/wow_enchanting_guide_warmane.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/52980435527.pdfIn PDF document text
    • http://tavawefojob.epizy.com/wugan.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/healthy_relationships_worksheets_uk.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/panojipoximokejozogabizix.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/82516732400.pdfIn PDF document text
    • http://xujogefup.rf.gd/mitogaxitumojamovoj.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/backbencher_new_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/65456855073.pdfIn PDF document text
    • http://keluwuvofaj.epizy.com/flashforge_3d_printer_file_formats.pdfIn PDF document text
    • http://kunipotow.epizy.com/89401744484.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/50029963016.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/gepobutezi.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_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 5300 bytes
SHA-256: bc84e4c0b2d93210543e94ff395e8476ae9e6993f0ada4a5c6942b0ddffc28be
font_01_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10828 bytes
SHA-256: cc4ef82d0254731b0eb893ff1b05ecf717b43e8fdb1cd672ca6a5dd4ebde4047

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