Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22805c3e493a531…

MALICIOUS

PDF

66.5 KB Created: 2020-11-26 15:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1d478daf237a4af8ca7f8ade4d72ee2f SHA-1: 31a2366eba1cd6eb7b59da3505950b42b0bc0c4d SHA-256: a22805c3e493a5311f3eba76ebe6cd4a4ff7bea43b19c070993452c12644ee2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection scheme.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/123?utm_term=centrum+flavor+burst+vitamins PDF link annotation
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/danuga.pdfIn PDF document text
    • https://zizevazemob.weebly.com/uploads/1/3/4/7/134716229/888e01da7d1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5f8fadcb7f698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5fa33c565e1db.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/gegubopobokexajuri.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/a61fb983.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5fad362e6d2df.pdfIn PDF document text
    • https://zirodaxe.weebly.com/uploads/1/3/4/6/134611642/lazikuv-xewonen-kesabopig.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/desenaz/mathematical_constants_finch.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/mozikizuzuniradipoduvobil.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/o_que_so_assentamentos_rurais.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/decision_makers_guide_capital.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/how_to_get_tik_tok_fans_without_verification.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_off0000c66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 5016 bytes
SHA-256: 5d7914de2dd105ed040b2a2d2c693a0e2b75f603a43fb9b9e4bbd077c4fbd758
font_01_sfnt_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 11264 bytes
SHA-256: 36a03e87e7226c590c7968b6e27255644f425b1d581d1540a722c7d7bb4d6e6b

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