Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc8ff637f87ba97…

MALICIOUS

PDF

74.9 KB Created: 2021-06-10 17:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c1f4b55e5df6f11988f38fa88348a81 SHA-1: 5123f72e598891ee1b58e72423e9ce28f4b18576 SHA-256: 6dc8ff637f87ba970fa2baa313c982b80e336488cd794758159a4ca5ad5d6f94
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 Pdf.Phishing.Trojan. It contains an embedded URI pointing to 'crewmak.ru', which is likely part of the lure to download a file. The document body, though heavily obfuscated, contains metadata suggesting it's related to a download, reinforcing the phishing pretext.

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://crewmak.ru/pbw?utm_term=clf+shape+bender+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410954/normal_60047cf334010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6011d08de6166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485152/normal_5fe003b400014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_60bb43498cc06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369333/normal_5fc8e5b68c715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe31307ce43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_60532b5ceb548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ff7d313ad55b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374177/normal_60b9b061a316d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/145037907/28415854870.pdfIn PDF document text
    • http://vinivat.pbworks.com/f/simaturogazatonakalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e8c47b-0300-485a-a322-d4a98f34bfed/48372716650.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144575700/bt_notifier_app_apk.pdfIn PDF document text
    • http://vafobotigef.pbworks.com/f/14012628559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b89d1d-9af2-4c79-a532-b03f8a0b61fd/arturia_microbrute_manual.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_off0000e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F6 5264 bytes
SHA-256: 0d7a3b61c049b67677ea82aab1c8cbf5938470c297b845c13942dc8375e4408f
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 11308 bytes
SHA-256: 798b919b22f74ff7ff5eb8b031ab201dfca44c9c2701c6c2fb415ab4166743d3

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