Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5eb9320c5efdf6b…

MALICIOUS

PDF

77.8 KB Created: 2021-06-02 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ab7671461b7303343a82210faa1ea192 SHA-1: e7ad367f02b57327e470dd8948e15ffe5c35946c SHA-256: c5eb9320c5efdf6bdc341b6f1b6ec813179ff2695e7d6d38b0cb558aa76080e8
156 Risk Score

Malware Insights

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

The PDF document contains numerous 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 malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

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 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://archism.ru/pbw?utm_term=how+to+install+inshot+on+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4475382/normal_60b0749fb1fb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5ff3562412a0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449614/normal_5fe1193216bfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451742/normal_6022e5986edd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5ff47cf33f9d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461234/normal_5feb9439adaac.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/nuvedivas_gowuv_dobupana_kuwutodawudak.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/5012823.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fec4d7e71574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_605d853c83d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_604da08ca10e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384472/normal_602ac278da0cd.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/bamog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zizovitunex.pbworks.com/w/file/fetch/144483432/wikizunobufokan.pdfIn PDF document text
    • http://nikekuva.pbworks.com/w/file/fetch/144426894/jasisusirelujoxofut.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425223/what_are_bipolar_junction_transistors.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/domestic_violence_statistics_2020_cdc.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/what_are_the_9_circles_of_hell_in_dantes_inferno.pdfIn PDF document text
    • http://bekivuxuga.pbworks.com/f/22273944312.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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 4976 bytes
SHA-256: 9a63b5da66290f75f7caa1079f084d2995a89a2d3342816a698177e25df304b0
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10700 bytes
SHA-256: fcc21f463ab4c2ee0ac866274a5c4f60059a246597f58567dcab12237100b775

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