Malicious PDF — malware analysis report

Static analysis result for SHA-256 207e6e3fa20b6c18…

MALICIOUS

PDF

85.7 KB Created: 2021-04-13 17:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ce3b054cb3f339a4e47cc0ebc030ad3 SHA-1: 950ef77d2d9e7a45c94c0b6fb1f75b6287b3ce1a SHA-256: 207e6e3fa20b6c186ab6ccd47ed457f11cb90cde52771a0115391504bd23b230
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 0.9998

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=acordes+para+piano+alabanzas+cristianas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ffb29b480064.pdfIn PDF document text
    • https://migusubab.weebly.com/uploads/1/3/4/8/134849844/6664262.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/5963a904.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5ff169a99587f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_5fd83bfc45bc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_603589722322b.pdfIn PDF document text
    • https://levixigaroli.weebly.com/uploads/1/3/5/3/135319998/tosobisizunekisil.pdfIn PDF document text
    • https://loligotobufineg.weebly.com/uploads/1/3/0/7/130739446/4126271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365661/normal_6025fe79284e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_3aa58968f5b74ef68c683a750c3c61ef.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_b862aedeeacd4d18ab912cced5e01c1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/39323893349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2b488a-1ad0-4ef1-8bc0-fbf9c65c1f45/72598919594.pdfIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_56c832f7e847423fbddd455b7d665128.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95e1b43-306d-421a-9bff-280005158e75/kebonevaz.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_dcef7a5f042741a5ae871bb6d07cc6ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukajevo/laravel_relationship_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/61352093973.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_9ecdb66adb5846d1a0dca33e0a070eb6.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_a28a8d5971104d4cb93e8f9d31a3f0f4.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_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 5244 bytes
SHA-256: 7285d4c9b8952e6c221168df29744076dbac8b1e057009144b02a63620314420
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 11856 bytes
SHA-256: 37e5ef056e4c3c67ea2d6ca1fae512a5e1955bc1e3fa6a187e8a0d50f9eb66b3