Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5124b0c975f4b28…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 00:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b0c08fd61d8fa99b05e1c1708dea2cb5 SHA-1: dd05af6dac65e7ce5cef8347eba5a7ff0899229a SHA-256: b5124b0c975f4b28914281cd1f62ccd86c05e33bb358044cc680ddf1ac643dcb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs suggest a phishing or SEO manipulation attempt, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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.
  • 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://zajinet.ru/award?keyword=ars+poetica+neruda+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420237/normal_5fe4e89f90a3b.pdfIn PDF document text
    • http://artelamp.store/2323573485ulmo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_601efef13f696.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/52097411351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_600bd3a6de586.pdfIn PDF document text
    • http://phulop.store/37408036633y7i88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5fde5bfd50f1f.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/almost_single_advaita_kala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_5ad5843d78f1477da4a8b0c08880d66c.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_55267b4695c544498842cb49ee9baf34.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_ca6cbce379f54affb935f6fd5dc52b56.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_94097267cc914dc09c27b6a120cda3cb.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_2fb56459bdfb469db3a7860f171646fa.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_86a6c9b1917c490ab3c57438ce8dad04.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_d40c6c99e57a44e182831297c89738fa.pdf?index=trueIn PDF document text
    • http://xobeminal.atwebpages.com/mukekekojuzupikovesi.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_f0289fe694d24c009f85d5b2c2536556.pdf?index=trueIn 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_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 5104 bytes
SHA-256: d7045876087d61baffab440a6bc2e846aa1752405ae507a28a0e513d00848308
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10660 bytes
SHA-256: b7a8b52683f57ce980ccfef466d9e3924ec0c7643d1172f79a0332cf86b94da1

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