Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b168290ef0f66a…

MALICIOUS

PDF

70.8 KB Created: 2020-11-24 06:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cc20c5b7d806b169e94388108784bc05 SHA-1: ec31d3df0f883e09697a9e93967bb1438d175124 SHA-256: 11b168290ef0f66ac2d7d4c01082f91231d330d8df695aaec1d4ed7cb5160fa5
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of a link farm suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=pathfinder+crit+build In PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fb92066b6b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8caa981398b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fadc214f3e52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5f98d2cf95297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f94125c67b54.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/tuvow-laminevub-balisimiravupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f88e4454ab07.pdfIn PDF document text
    • https://fepanaxowa.weebly.com/uploads/1/3/4/3/134311119/gezalifif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_5f9976ce2af91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_5fa5631229132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_5fa98294ee1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453888/normal_5fb4f3d59b133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f9333b1b2cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f993c3cd242a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 5072 bytes
SHA-256: 25b87877f23d043a814dc40321ac08436d74f3e73a3d89223854a95920cc78d8
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 10500 bytes
SHA-256: c39c367eaf678194967130b504246d07a4c701ddfb3ca1a7d046a1c10227d9bb

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