Malicious PDF — malware analysis report

Static analysis result for SHA-256 424f23a460e48400…

MALICIOUS

PDF

62.4 KB Created: 2020-11-25 03:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 35067c47196ed562270c70e8fc7834d4 SHA-1: 00aa77084578b957432dc982c85411d8e254332c SHA-256: 424f23a460e4840094e8b380af2d5ca7dc20750dceafffc298feb0ab9b6b60c1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffking.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates the PDF acts as a link farm, containing 22 external PDF links. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=singer+tiny+serger+parts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f9e1e576a0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_5fa0577c29480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f9b985829db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fae1d78c2562.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/a5c92918ab2db11.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/tulosa/zetegedepi.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/family_tree_of_abraham_in_the_bible_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/amharic_bible_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e7b0bf-3122-411b-b5eb-a80a1a373ec1/84165273235.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/esc_guideline_myocardial_infarction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4509ef1d-55df-4e1e-94e3-e37b6080e928/92405027904.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_off0000b2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AA 5160 bytes
SHA-256: 41cb24872db609bb8fabdcc940284b96d0da8fae3c5b61afb22f2c3027d20e8c
font_01_sfnt_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 11600 bytes
SHA-256: 2d40a7a881e9c6704c83320d172c67da14e40f2ed9051367d40659f5009d564a

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