Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efc442ab5b1dd25…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 05:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dcf61ea450a5ac63e28efba0978da4e9 SHA-1: 393dd194b413fd126f362a36e28bd75d15810582 SHA-256: 6efc442ab5b1dd25bfd798f5c8911661d07c7edb65100535221a9a89bc4b6f94
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/aws?utm_term=how+to+learn+drawing+in+procreate'. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The document body, though heavily obfuscated, suggests a lure related to learning drawing, which is a common tactic for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/aws?utm_term=how+to+learn+drawing+in+procreate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_6021acbcbb183.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/7hdjjja/76217479923.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/XgftEox/all_star_basketball_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/gihdiiJ/59120203813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_602c70448447b.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/hfAHij2/legion_builder_orc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_6025097d65864.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/gHjh9gi/pedumuwinozexadubulafeko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb942bee5b3.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/ifcvBI3/skater_girl_aesthetic_makeup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_600d166152e68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujemivegelap.epizy.com/isobaric_isochoric_isothermal_and_adiabatic_processes.pdfIn PDF document text
    • http://giwimev.rf.gd/windows_10_pro_1803.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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5116 bytes
SHA-256: d9d41463a6c62518d7363c337bc8206f0c867cc0c33fad05307f7b9afa31a31c
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10284 bytes
SHA-256: bf1837801afddf025d81e0e697a318512af3b41019f9989f86d9804d6c46f32b

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