Malicious PDF — malware analysis report

Static analysis result for SHA-256 2352845e252fac69…

MALICIOUS

PDF

75.7 KB Created: 2021-05-07 14:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d844552ca8ff278d6fe11154c95d8a1a SHA-1: 88c3d1036360bb26659c256506e6930f11ad6263 SHA-256: 2352845e252fac69ed4cfa3e7c913823cb9e24e9bf8e4183260a1521d9a1e599
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links, 'https://zajinet.ru/strik?utm_term=what+does+quoth+the+raven+nevermore+mean', is suspicious and likely leads to a phishing or malicious site. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body appears to be garbled but contains remnants of the title and authoring application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=what+does+quoth+the+raven+nevermore+mean
    • https://static.s123-cdn-static.com/uploads/4421623/normal_5fedfc4de1f73.pdf
    • https://cdn-cms.f-static.net/uploads/4402951/normal_602ea681506f2.pdf
    • https://cdn-cms.f-static.net/uploads/4393889/normal_606c3e94cf037.pdf
    • https://cdn-cms.f-static.net/uploads/4392869/normal_603caebfcf67d.pdf
    • https://static.s123-cdn-static.com/uploads/4387035/normal_6001c026a8c45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_43a83eded8c7474ea2331cbe859c9dec.pdf?index=true
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_b12937e3c3f84951aace03d4f9a5906f.pdf?index=true
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_814328dccab240f08c7850b605cf4b3f.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_e5261ef240d948fe90b9391f2fa5b0ac.pdf?index=true
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_09dff864489545c2a8591619f6628762.pdf?index=true
    • 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_off0000ed3e.bin
e8c45f95c07f0d664598885bdf9c17e50dd7b6d111199beef703408d1f83004b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 5232 bytes
font_01_sfnt_off0000fef0.bin
9d2e1c83e4e59adb0994e18c7fe8f3be7021f0e91a0215d70667bd2148098c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 10764 bytes