Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd8dfbf6666283a…

MALICIOUS

PDF

71.3 KB Created: 2021-01-27 20:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 72a5a66e70f56115d553897c19af10a5 SHA-1: d51270ffa7fe230088cb5678bceb79331db983fd SHA-256: edd8dfbf6666283a125c42e7c1482813575d3dc18a302f00f11e195c4966e3c1
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=how%20high%20up%20do%20you%20go%20when%20parasailing In PDF document text
    • http://telgrm.site/zorikidoru5qa2q.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/7806004.pdfIn PDF document text
    • http://bnl-jobs.com/107216789365q3in.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/3125007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fc60f3b64386.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/96332191d21885f.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/1e010b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_600d02c26a13e.pdfIn PDF document text
    • https://gajifawegux.weebly.com/uploads/1/3/4/6/134649352/pogubesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486060/normal_6001de0d426bc.pdfIn PDF document text
    • http://mnogoturov.com/223127117780rq9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_60053a15da64b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485589/normal_5ff4ca6cd6a7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_6005e4c551a33.pdfIn PDF document text
    • https://toxafowusolele.weebly.com/uploads/1/3/2/8/132815148/3191631.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/85c9c9f77a5048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_600e9d5379526.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/f624bfa3ef2.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/fujadabez/bose_qc_35_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/beetalk_for_pc_windows_10.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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 5376 bytes
SHA-256: 011cbffb4aa4ccfeeb9927d230f393310ad02932b57bfbd4b22e8e1775ca1d78
font_01_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 10496 bytes
SHA-256: 80b4b03bd25021078b1d4a68c0217a3359ceb6dc40fdc85b81fb8e4e44810aae

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