Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b89f34d8c744f4…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 16:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68791136e4d76d74de808a677c2ad8d3 SHA-1: 8d8c07a09b35005565657f034ad5e444b45b9020 SHA-256: 77b89f34d8c744f412d5e157df308d051d90b0685b82ba825d66d086ead288c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains embedded URLs that likely lead to malicious content or phishing sites. The ClamAV detection indicates it is a phishing trojan, suggesting it's designed to trick users into revealing sensitive information or downloading further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://feedproxy.google.com/~r/sq/ugae/~3/hIkXU_AiHkM/square?utm_term=math+riddles+brain+teasers+with+answers
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e833acd56f0f361274aee8/1625830317018/dexomezisu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed0d99cdb2ce13c5223c10/1626148249977/what_works_for_proof_of_residency.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e9070eaa30721e65ee01cd/1625884430842/healthiest_fish_to_eat_2020.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e78f904261ba79805cdcd0/1625788304343/the_gradual_release_of_responsibility_model.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8514154eb17b684a2107/1626113301045/92118285405.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e91d4d2210ba6bce12049c/1625890125700/tavern_101_grill__tap_house.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e772af9d016f55d43ed71a/1625780911662/jiwowowevatosivajesapogi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f11d589014c44c528f94d4/1626414425033/26213855369.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e78a6b6d117d6eec9f29ba/1625786987441/right_side_up.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_off0000f4b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
font_01_sfnt_off00010cc2.bin
a2c8b9d69b9774829770496c7ac28537f6d755436589b2049b7a6452670bfa03
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 17396 bytes
font_02_sfnt_off00013a64.bin
8158ed4038fbdd0538d88071c140781321717e36d4d50c0ec1d2579393eb66a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 10444 bytes