Malicious PDF — malware analysis report

Static analysis result for SHA-256 6827c22effc1d575…

MALICIOUS

PDF

76.7 KB Created: 2021-05-24 14:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fda51845cee2cf9efd82eff74dc7ab52 SHA-1: 120700fa6eb11dbaa9372cec588079fd0eded523 SHA-256: 6827c22effc1d5750d18345121acdbb18907c33fbb520ffb83a0b863a705816e
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 0.9956

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://maypoin.ru/strik?utm_term=batho+pele+principles+poster+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416493/normal_6018d50339268.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/5074391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_600bef965927a.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/kazezaxub-pozaforafafoje-nokonazevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5fe6abe4ab6b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5ff664de57a5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_606293805c613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_5fd12ef9e9fc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_60689004ddcfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_5fd7741e427ce.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/1935216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9b809acee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384835/normal_5fe0e379b3b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_606631ed3ddab.pdfIn PDF document text
    • https://jujarodi.weebly.com/uploads/1/3/4/5/134507231/ac8336126ad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462056/normal_6035fb3279f82.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/vebenok/nifeduratini.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/70097127822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54e4f819-1bdc-40a4-b3b9-52ee2d8f5df9/78044338802.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/xarusokemaladukujex.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/contabilidad_de_costos_aldo_s_torres_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ca6cf8-f241-41ff-ad76-f502dd232873/causes_of_pimples_on_forehead_and_chin.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/how_to_start_your_engineering_career.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa91927-bfd2-402e-9703-92eab25c9bd2/zijoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def50f50-98de-43c3-8fa4-db16c81b18bd/how_to_replace_lg_washing_machine_bearings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25301ea6-26f9-42d4-8760-67cfe232ffd3/mirofab.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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 5292 bytes
SHA-256: cab3739d131e15f9900415b5291d78a543d64dd60a110bbb7ed29cdca35b1af5
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11032 bytes
SHA-256: b66c9981233e118038e07d2f2514f0bd085dc1b0c19bb21af57383b0d77674b4