Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf94b018d792aa74…

MALICIOUS

PDF

66.5 KB Created: 2021-02-27 17:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3158014063600175862bc4c2209f9beb SHA-1: 3c45fda7601c4dd3167b247cd4bf7b8f271e8fb1 SHA-256: cf94b018d792aa74e499dd6aec23285eb061b926221c71315f05f5334f775653
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest it's intended to trick the user into visiting the malicious URL.

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://kuzutuzo.ru/strik?utm_term=reading+body+language+quiz PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5fe59db181a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_601b8c146d104.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490366/normal_5ffcfd2d26f05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5ff6cf4dea3d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcff61fb1672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_6035aaa0c6ddd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_601cd7bf32260.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5feecc0682424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369305/normal_6002ecaec5c47.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/12_month_project_timeline_template_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_601d5f5966fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375503/normal_5ff1142977326.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/nefunupu/xisojoretegip.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/33280716933.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/how_much_does_a_hot_springs_hot_tub_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/97724689328.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/b_v_raman_astrology.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/14017939707.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/92542720415.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 5144 bytes
SHA-256: 77ff2a002084d212ca5371d6fecebe3b2ef6c68d184941b576989a4c07dc94f2
font_01_sfnt_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 9808 bytes
SHA-256: 290b2a17b1fac89bb655d8b129b963db4f87174e8dfc5ffd8af2e97630162f0f

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