Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a9774fe6ea2140…

MALICIOUS

PDF

97.8 KB Created: 2021-02-20 12:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f240a89d0d3937942db0d49b63c4276e SHA-1: 9e9d8314ca8d44cd59491fc75de3e26623659aa2 SHA-256: 81a9774fe6ea21406323976bf5243c2d6b24b2520e8982722c07bb9393903f88
136 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as Pdf.Malware.Agent-9978908-0. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security scanners. The embedded URL 'https://druttle.ru/123?utm_term=merriam-webster%2527s+vocabulary+builder+mobi' is likely part of this lure, suggesting a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Malware.Agent-9978908-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-9978908-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/123?utm_term=merriam-webster%2527s+vocabulary+builder+mobi PDF link annotation
    • https://cdn.sqhk.co/muligumixe/78aPbK0/23694369232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_601f085beeb63.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/dHgB9jb/mekelotonoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_6012b2a783b63.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/ghfjdja/vazogufuxipedem.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/j8LgjbJ/game_troll_adventure_2.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/savukojubusum/portador_de_anemia_falciforme_tratamiento.pdfIn PDF document text
    • http://kozolopufel.rf.gd/70825491901.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/rocket_science_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/selijeketexadaxad.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/child_cartoon_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/90016281978.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/delete_page_in_word_2010_template.pdfIn PDF document text
    • http://jipinasin.epizy.com/71838707911.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/82109784750.pdfIn PDF document text
    • http://xagexof.rf.gd/brihaspati_dev_images.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014246.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14246 29056 bytes
SHA-256: 663e59389f521f01c20c3c02c8673c36fbc9955bcecb380f50acf6d4e4a9be8d
font_00_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 7044 bytes
SHA-256: bc7d78de3057b82b90186c06d6c1a360fccc573ffa3bc3d11b9f1de3fd1d0a0c
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 5548 bytes
SHA-256: 2b33020a2a5949e8659a8daed6e97e335f6c73a7979f3f94c511ccd8231b442b
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 11100 bytes
SHA-256: 1996f5f90c2dbdc9f0497d569ac1ffc805fec1c70e400b2c4059130d3ddaf599

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