Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c7a183e11ac474…

MALICIOUS

PDF

69.0 KB Created: 2021-03-15 07:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5739b238c6a747907f51ed4e40460d64 SHA-1: d26210c8f8ce9562c95a2dd5c6e9feb272418ab1 SHA-256: 60c7a183e11ac47455bbca739ffcea048efb2f2ce837bc554121b1ffa77dadb1
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to 'zajinet.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a schedule, likely serving as a lure. No scripts were extracted, but the presence of external URLs and the nature of the detection indicate a phishing or malicious content delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=penn+state+club+field+hockey+schedule
    • https://cdn-cms.f-static.net/uploads/4528915/normal_600b0ed7261ce.pdf
    • https://static.s123-cdn-static.com/uploads/4369794/normal_6002967190e5b.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fe6173c99f3f.pdf
    • https://cdn-cms.f-static.net/uploads/4485695/normal_600c124ea43ef.pdf
    • http://morasuxod.getenjoyment.net/cell_cycle_and_dna_replication_practice_worksheet_1_answer_key.pdf
    • https://cdn.sqhk.co/jonimaze/jfjhGjb/new_silver_cloud_inn_tacoma.pdf
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fcff3dbe1405.pdf
    • http://luxasireku.sportsontheweb.net/sql_server_books_amazon.pdf
    • http://nupesupo.mypressonline.com/14495007876.pdf
    • https://static.s123-cdn-static.com/uploads/4374708/normal_5fcbd2988798c.pdf
    • https://cdn.sqhk.co/burexewejam/Ashcdif/2945322812.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_3e85539e23004bf887a9ea362040f21f.pdf?index=true
    • http://palibam.atwebpages.com/in_vitro_antioxidant_activity.pdf
    • https://s3.amazonaws.com/marimejerebo/48179052153.pdf
    • https://s3.amazonaws.com/bufexa/kimatutijuvizukekonaf.pdf
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_02a2ace3422446698cbea3b647f31372.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_42ba70fcb4cc47e5a5acf2107e2547b3.pdf?index=true
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b6c7e4ce420645d193a62833ad34f496.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_7311b59c82ab48f9a93abf80e9800f53.pdf?index=true
    • 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_off0000d09b.bin
fe2d8f0a178f00bfb42e854390f74099848a93682b751ceccf533c84b6b25f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 5320 bytes
font_01_sfnt_off0000e2b7.bin
e683858d4ea7e53a3c684405882049518f01b7eb780928a828f4b8ab73ea1e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 10636 bytes

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