Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f805b95d7ed55…

MALICIOUS

PDF

80.5 KB Created: 2021-03-10 02:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fc4294d41892759e32e8ed9c7a57aef7 SHA-1: 81835fa8ddf23f6e62db8db3ddfc7c0df4bbf658 SHA-256: 1c3f805b95d7ed553f6ee00ac6d6031fe55d581c28ae9ca293ac4e5fddb169ec
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, 'jumiwimov.ru', which is likely used to host a phishing page or distribute further malware. The document body, though heavily obfuscated, contains metadata related to its creation, suggesting it was generated by wkhtmltopdf.

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://jumiwimov.ru/strik?utm_term=today%2527s+julian+date+2020+leap+year PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476294/normal_600bbe56ed7db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5fd038de4a868.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/18525063244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_602b029a2afe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_602c6bf2a877e.pdfIn PDF document text
    • https://cdn.sqhk.co/wisulekekij/fZhf2RG/uber_driver_sign_up_promo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_6034d72f78348.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/jipjdih/microsoft_edge_web_browser_download.pdfIn PDF document text
    • http://zabotefix.iblogger.org/28625301371.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tadevewuju/lonujosaza.pdfIn PDF document text
    • http://dogabofeki.epizy.com/pancreatitis_guidelines_nutrition.pdfIn PDF document text
    • http://tatefubuzu.rf.gd/59011413522.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/xinodezegiboxazeli.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/fronius_primo_datasheet_australia.pdfIn PDF document text
    • http://favuzokusom.rf.gd/fonagigukuzedeb.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/7624683842.pdfIn PDF document text
    • http://dusegakalo.epizy.com/23395145431.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/makedikopirogowusilu.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/greedfall_guide_walkthrough.pdfIn PDF document text
    • http://worurekebisur.rf.gd/rumelar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 5272 bytes
SHA-256: a537ff020e4c3708b6b2a8c0e27263cb91eeed1f53c46bd8a275d49bab7ca698
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10896 bytes
SHA-256: 5d8c38da5f8a732e59de48403294c889379b9e8abd3da85bf00e31823ca37589
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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