Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5838bede2a2e3e4…

MALICIOUS

PDF

83.2 KB Created: 2021-02-23 09:25:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90e51a7a3e5080c36ef98de4a5d60502 SHA-1: 9a125ed34f482b72649bec95247e170bc4713a2f SHA-256: f5838bede2a2e3e41f7eb88bdc3289d826315be21fbe3eeaea3b7f8b0cc1a9a6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=nyct+bus+roster
    • https://cdn-cms.f-static.net/uploads/4459170/normal_60148f284efc7.pdf
    • https://cdn.sqhk.co/xemugugafot/cB0Smhe/rabaliz.pdf
    • https://jetakazam.weebly.com/uploads/1/3/2/8/132814031/4957771.pdf
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/afd00c4f33.pdf
    • https://static.s123-cdn-static.com/uploads/4393890/normal_5ff0b83074e40.pdf
    • https://cdn.sqhk.co/jisaside/ngiiaif/cytosine_is_complementary_to.pdf
    • https://cdn-cms.f-static.net/uploads/4460970/normal_6009da21a9f20.pdf
    • https://cdn.sqhk.co/dudugetogi/ihiP7hj/maxofuganimutomijefoni.pdf
    • https://static.s123-cdn-static.com/uploads/4485696/normal_5ff410573463d.pdf
    • https://static.s123-cdn-static.com/uploads/4490920/normal_6007bf28efd80.pdf
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ff6810327218.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_6010f2ee5bd06.pdf
    • https://fukikabigo.weebly.com/uploads/1/3/4/4/134457586/doferivedeb-verax.pdf
    • https://cdn-cms.f-static.net/uploads/4457620/normal_602b2c9e226bd.pdf
    • https://gesaseli.weebly.com/uploads/1/3/1/3/131379828/1247648.pdf
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/wipekusifiw-laxigarik-tifowafew-fotiwa.pdf
    • https://cdn.sqhk.co/werutojij/M6Uhd2E/break_the_glass_ceiling_synonym.pdf
    • https://cdn-cms.f-static.net/uploads/4466140/normal_5fd6c35274cde.pdf
    • https://cdn-cms.f-static.net/uploads/4478414/normal_603033b1d0e30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010779.bin
d48f281da0519f898d51889171dcaa1edad908f1d6a41895feeec7aeb394f91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 4760 bytes
font_01_sfnt_off000117cb.bin
842f1a1ae0fd3e1cdee79fb984d9ed3c71f69eecca61d159459052fc4af0b482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 12536 bytes

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