Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f624f1df33b81e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-12 08:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 343f9493d9849e1d9a4314155db74a5a SHA-1: c0e42b3d1c161fc5ef495148657a5786190a3861 SHA-256: e4f624f1df33b81e50dfc22259a8167306b6099315b580a46266bc83db963c33
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://botokaw.ru/award?keyword=general+pathology+atlas+pdf', is a key indicator of this activity. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may leverage embedded JavaScript or other PDF-specific exploits to redirect users or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=general+pathology+atlas+pdf
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/pevegarelo.pdf
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fce35ef372d1.pdf
    • https://bemixujigimo.weebly.com/uploads/1/3/0/9/130969474/fabapifa_vesonon_gilejato.pdf
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5ff601653906a.pdf
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fdee480e975a.pdf
    • https://static.s123-cdn-static.com/uploads/4387040/normal_5fde241a0bc84.pdf
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/6c49d42f1de8.pdf
    • https://cdn-cms.f-static.net/uploads/4466161/normal_6029d980a2132.pdf
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5feec4e0c5652.pdf
    • https://filududo.weebly.com/uploads/1/3/5/3/135390237/tifejo.pdf
    • https://pudeputuxokaj.weebly.com/uploads/1/3/5/9/135968230/5365048.pdf
    • https://cdn-cms.f-static.net/uploads/4420432/normal_5fe7bce2d5b71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ditiruz/1734429385.pdf
    • https://s3.amazonaws.com/daselex/24919153715.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/3636426254.pdf
    • https://s3.amazonaws.com/kalanejaxutilif/bavefinopobuzu.pdf
    • https://s3.amazonaws.com/tubukeganuji/cad_furniture_blocks.pdf
    • https://s3.amazonaws.com/kugelilizibuwum/joomla_church_website_templates.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/best_free_graphic_design_app_for_ipad_pro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin
53c0a438699b7bfa12a746d132cad1031246baeadacb24b2178cba589c8fa55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 5436 bytes
font_01_sfnt_off00010b2a.bin
9df9880a2b8a315a1340663812ae89630fea740d26907571c78106cdc320e98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 10212 bytes

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