Malicious PDF — malware analysis report

Static analysis result for SHA-256 495dac1c7b0bd3df…

MALICIOUS

PDF

68.1 KB Created: 2020-12-20 20:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 74bc32163e307e9f4c5766cf257f3349 SHA-1: 45000b352e8134a790e27482d54ae0fbaa248589 SHA-256: 495dac1c7b0bd3df1f38925b25017a73b0a6cca667c493424cf2c4d0ce7c9bea
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and part of a link farm. The embedded URLs, such as 'https://traffking.ru/strik?utm_term=best+library+programs+for+tweens', likely lead to phishing sites or further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://traffking.ru/strik?utm_term=best+library+programs+for+tweens In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f966f759e578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8cb817c9b0d.pdfIn PDF document text
    • https://zuforupixonop.weebly.com/uploads/1/3/4/3/134394080/4855677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417543/normal_5fdf4e3690c8a.pdfIn PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/jawuduxuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_5fa6d0f09169c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_5fa6dd8eab04d.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/gitezajokadeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f8b3c1823d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f8b518eaeda1.pdfIn PDF document text
    • https://rutijafajiwep.weebly.com/uploads/1/3/4/5/134592903/949616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/xediboluxosi.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/iowa_high_school_softball_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/snapdeal_bombay_dyeing_double_bedsheet.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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5604 bytes
SHA-256: 27a9a3a192e9841d0f16bca782947e13db4e7013e02ac52df0af2aa33f941e83
font_01_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10656 bytes
SHA-256: e8f825a52895624af51b7a15b4658125f651306dc5f2f5cd4d7543c6fb8c9672

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