Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a915c39ea498aa7…

MALICIOUS

PDF

64.6 KB Created: 2021-01-01 12:12:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7c92bc8f21169152c6d831aa0c3bd5ad SHA-1: eaca9f490ffa3cdb432a95cbb11334d86dcd0983 SHA-256: 9a915c39ea498aa7a42b0cc4b33209a1fad53aee4a23fd11ffb1f653018165d9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and Weebly subdomains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly support this conclusion.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=libro+cazadores+de+microbios+ensayo PDF link annotation
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/rexajuge.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/1501489.pdfIn PDF document text
    • https://vugiwaxe.weebly.com/uploads/1/3/4/7/134739196/6968809.pdfIn PDF document text
    • https://mejavepo.weebly.com/uploads/1/3/1/4/131438157/4782350.pdfIn PDF document text
    • https://sagopitura.weebly.com/uploads/1/3/1/1/131164573/3429635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_5fbddd8a5f165.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/kejojem.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/nesel-xagilizoni-wulaxur-xelonuda.pdfIn PDF document text
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/xisugizolomok.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/jipomipuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfc8e60-eccb-4bd6-b092-4f6fe2a26c6f/80810233629.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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 5284 bytes
SHA-256: 6a99504844456413b7db4da79209dd6b212a6f7601e88ab9fb83f8c4e5611aff
font_01_sfnt_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10676 bytes
SHA-256: 8d475130f3b00add3ac2d8cb7686cdb3957c8b22f779c61a2a514c61d4248424

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