Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2080f12947fbdce…

MALICIOUS

PDF

67.2 KB Created: 2021-01-25 15:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7e913a24fa00ca14b8155931f592ee3c SHA-1: 967d367c27158f58e2e8d974d2b2524d31531170 SHA-256: a2080f12947fbdce279ee8ada9ec68e9f4e8fd2d3be48a3fc3ed4df7941ab08b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links, suggesting a phishing or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to harmful content.

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://leonvi.ru/aws?utm_term=converting+units+worksheet+gcse PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366005/normal_5ff855e2d7ffc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415768/normal_5ff2e3eee1ea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6009b2b858c92.pdfIn PDF document text
    • http://straponartist.com/97340466833bkpna.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fe2070f8acb0.pdfIn PDF document text
    • https://xusudunegowubub.weebly.com/uploads/1/3/0/7/130739081/tipizivagi-voxapoled.pdfIn PDF document text
    • https://paxituzupinemof.weebly.com/uploads/1/3/5/3/135303349/6996e.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/toliwudalamem/fazaritoxoxojado.pdfIn PDF document text
    • http://meduzifovum.epizy.com/evendale_ohio_police_reports.pdfIn PDF document text
    • http://jexusapije.epizy.com/my_excel_sheet_is_grayed_out.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/punjabi_song_audio_gane.pdfIn PDF document text
    • http://deburukibovip.rf.gd/animated_family_tree_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/nonebaziwugu.pdfIn PDF document text
    • http://pebulibupa.rf.gd/fireeye_agent_deployment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/expected_family_contribution_worksheet.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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 4940 bytes
SHA-256: f105d1cb06ccb4b43761977a50b8b3f3552ee3d3177827b36f22bf8f3c7f60fc
font_01_sfnt_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 11552 bytes
SHA-256: 4208100cf526776c742923715c72815cbc91307a416fb6a8a16602cf36355ebf

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