Malicious PDF — malware analysis report

Static analysis result for SHA-256 b217e8356af1b3a1…

MALICIOUS

PDF

71.4 KB Created: 2021-01-10 11:35:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 011e9033ee01d0dc52a741fbb0ef36ec SHA-1: 704820fa53e2de09a815eb64692f740f942b292c SHA-256: b217e8356af1b3a19f18060c87f0f3bfc81127be4369b4aa37f96e05df5f62bd
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'traffset.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to an 'overtime request form excel'. No scripts were extracted, but the presence of a malicious URI in a document flagged as phishing strongly indicates an attempt to redirect users to a malicious site.

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://traffset.ru/aws?utm_term=overtime+request+form+excel
    • https://static.s123-cdn-static.com/uploads/4365634/normal_5fe27081c2985.pdf
    • https://cdn-cms.f-static.net/uploads/4489716/normal_5fb74e8079182.pdf
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5fe119c190ad0.pdf
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5fe6cb690e94c.pdf
    • https://site-1211946.mozfiles.com/files/1211946/trendy_nail_designs_2020.pdf
    • https://site-1177244.mozfiles.com/files/1177244/shooting_games_for_ps4_with_gun.pdf
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5f9ad972e5112.pdf
    • https://site-1179952.mozfiles.com/files/1179952/noniwezaxewuwawumoji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/rudari.pdf
    • https://s3.amazonaws.com/palikuvexake/artaud_poemas.pdf
    • https://s3.amazonaws.com/kakekojezutok/31365017669.pdf
    • https://s3.amazonaws.com/wexukufedepim/pebetipen.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin
6fb1a514d5a5ad081635d7cc163f46089667a4d1a0e12391ae225ae114a30707		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5096 bytes
font_01_sfnt_off0000eceb.bin
d44a7021a1ac5c38843ad7ae238c2f1c30a9e80d8e8d08a3d0494e3814ea6c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 10608 bytes

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