Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b0a5c33ac6b026…

MALICIOUS

PDF

61.5 KB Created: 2021-02-12 16:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ef30199244bc4174c18feabe0216716b SHA-1: 1d4140d675e9ea35f5f0fb8ed83df5d6f6ad7604 SHA-256: d9b0a5c33ac6b0264c9bf19753a539dfe3afc43482b5b50459e64dd1dbaab96c
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URI points to a suspicious domain, likely intended to host phishing content or a further stage of infection. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing or social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=stoichiometry+percent+yield+worksheet+with+answers PDF link annotation
    • http://rm-swis-mine.com/liszt_standchen_piano_sheet_musicr0mhl.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/H0ijyhd/word_jungle_free_word_games_puzzles_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/2hjijns/48259946160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_600f40e878844.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/jukezeluf/charmed_season_3_episode_23.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/86495109012.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/metal_gear_solid_2_pc_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/xurilesupomub.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/59128869905.pdfIn PDF document text
    • http://finuzajobozosom.epizy.com/linux_mint_best_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/nojiberidupofibum.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/61935372913.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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 5676 bytes
SHA-256: f3a6bc62dd38cadaf5e42ec08540b74835c739aa57a127b1f30d8a812bcf6790
font_01_sfnt_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 10060 bytes
SHA-256: 21ac9c8dd3e28f8cb745ff3d84607a4387af126b4f53022da8553a02fd731643

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