Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bb961f933a4a8b3…

MALICIOUS

PDF

81.5 KB Created: 2021-07-13 15:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba782e207d0e48042a8f43ac32f6bfe7 SHA-1: 6bc42c91f0320e5c99dedcab33629610f407efb1 SHA-256: 1bb961f933a4a8b3040c485d5f9c002da1e52c37cb2487e8964d1312f8264430
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI pointing to 'coretry.ru' was extracted, indicating a likely phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of an external URL suggest it's designed to redirect users to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/square?utm_term=pawsitively+purrfect+pet+grooming
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9449292abcc18c4f73733/1625900178183/email_english_2nd_edition.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed89b8fc46f1629a06b498/1626180024949/lunuzapidexunisidurabew.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec820f67baa26076bb9a5b/1626112527831/paul_hollywood_and_candice.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecf409bde79631d339530d/1626141705951/12771093752.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ece02cf8b4e244e4f72b05/1626136620233/baby_daddy_watch_online_with_english_subtitles.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec930eaf807f1e1526adaa/1626116878621/53446880699.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82f287be683581ce5d6a8/1625829160232/iso_guide_73.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9087f025aa46e30d1bcbb/1625884799486/37402269117.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81742ce8457037ee4e934/1625823042999/13656075108.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f79883ae0c49023743fc/1625880472722/40471229576.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed3722b1b13d3c3c0f24bc/1626158882433/zifaxinexipobupanerewes.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8f778aa30721e65ed4405/1625880440509/suxulupisewegovaku.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e79489a3609a707ba81eea/1625789577864/eagle_scout_project_proposal_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96c.bin
a2ee49326e21888205c836d4649292d99338d7d99fa435bcb54d2ae68ce72c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD96C 11188 bytes
font_01_sfnt_off0000f3bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
font_02_sfnt_off00010bcf.bin
6d4ea516b7ce1a9aee4e963077574970c002146d80ddad8be63011adfbb69886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 17212 bytes

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