Malicious PDF — malware analysis report

Static analysis result for SHA-256 98749a065d348ed1…

MALICIOUS

PDF

64.5 KB Created: 2020-12-07 13:56:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43afbaebdceca0b403449deb29b76d27 SHA-1: 175d42085666c17e6a71ae0e49d957fe39e44435 SHA-256: 98749a065d348ed114d3fae9b041dfaeef154cb380bd37edf2daf130574d30cf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least two identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes 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://traffine.ru/strik?utm_term=mary+had+a+little+lamb+recorder+notes+with+letters In PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_5fcc1c6fbdc5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f8949c3a285f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_5faff608b297e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fa2648dbc1a2.pdfIn PDF document text
    • https://nogusevufofe.weebly.com/uploads/1/3/4/5/134525370/2bb8b62411c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f93f90ebc44c.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/bukudevanag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5fc4af2cd78f0.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/bojafazes/92815342773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02890064-c268-43eb-a32c-aff0f6c81427/rent_free_letter.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfb17d334513fae41fd2d/1606220567742/zugigowuvotuguvibigo.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/women_s_jeffrey_campbell_platform_sneakers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ee4cde-5ab2-4ba4-8aba-99114f7c8ea0/kogepudetimiv.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_off0000be51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE51 5516 bytes
SHA-256: 4fc60aa8466399f9ac439e78d84d9c2fb95307dbedee876f0db1df63639d2757
font_01_sfnt_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 10496 bytes
SHA-256: 61b89b41ce760dceb630f46289b1eb868970823048c53852a3986308fb732575

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