Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f34eb8f4d1a5d85…

MALICIOUS

PDF

79.8 KB Created: 2021-03-13 21:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ad27dcd29889f84ff17e6f9664082eff SHA-1: 20e5f96b851038cca3cc2658969b99dd78891ddc SHA-256: 9f34eb8f4d1a5d858624abf3e7fdf5cfe580ba2739b0b45b56143a06f6261611
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/award?keyword=cell+structure+and+function+pdf+ncert PDF link annotation
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/7609046.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/doxig_xetakoxipeja_gafubuno_dalakozig.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/momosivire-vipawokasawisav-womam.pdfIn PDF document text
    • http://vovality.club/podagikjqb4w.pdfIn PDF document text
    • https://nerutemiwuxofa.weebly.com/uploads/1/3/1/3/131398157/565cba9624f1.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/0Z1ehgL/26694810086.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/bji5ijj/aprilaire_700_template_dimensions.pdfIn PDF document text
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/mipaxireki.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/9010734.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/ugjig3l/risufezepa.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/028f9471.pdfIn PDF document text
    • http://chtotakoebezuz.biz/92686517639zwy0o.pdfIn PDF document text
    • http://masajsalonunuz.com/varewewefasu1sz3x.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/1924689.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/sowajus-lunexi-gigijogakafeze.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/gipuwivulupu_nidusamukafubu.pdfIn PDF document text
    • http://cardio-active.site/edelweiss_guitar_chordsv9idx.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/geVhclD/homeschool_activities_in_charlotte_nc.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/ibjgcjd/56654913075.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/gurowozenupifi/86097719453.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/57752530746.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/pirates_of_caribbean_2017_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/the_age_of_adaline_movie_mp4.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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 5052 bytes
SHA-256: f60440c48817ed03ee59ab6a37554a2ba01d12d7be4287d3f2c561f7659dc6f3
font_01_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 11096 bytes
SHA-256: 09dd1eba417a6f03513588075c6a923483719b1409c122c3ea966e3ea56bb0f0

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