Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda9ae8006452163…

MALICIOUS

PDF

68.2 KB Created: 2020-12-18 09:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6cf18c04ef60e94fe9e2f3ebc6c30ca0 SHA-1: 51c909d0ed33dfc6d315b3cdcfd14e5b6a132550 SHA-256: cda9ae800645216321f5980dc54f36ec21b1bc4efe0942ad281c83e49b4e1a4e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

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://trafffe.ru/123?utm_term=meijer+birthday+cake+review PDF link annotation
    • https://jobexukutet.weebly.com/uploads/1/3/1/4/131452991/sudibotodoz-kipewoxezuwapep-kewejilo-mowatekuku.pdfIn PDF document text
    • https://zuxutupod.weebly.com/uploads/1/3/4/5/134587355/4527946.pdfIn PDF document text
    • https://guliwomijura.weebly.com/uploads/1/3/4/8/134846957/9a94da7b007ab09.pdfIn PDF document text
    • https://wofenexezut.weebly.com/uploads/1/3/4/3/134310974/e0bd029c.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/3409757.pdfIn PDF document text
    • https://pejapuvurexoku.weebly.com/uploads/1/3/1/6/131636728/bfd2c0.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/votituzolas.pdfIn PDF document text
    • https://nutajutibasetak.weebly.com/uploads/1/3/4/6/134638930/5f623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0c900b-7d57-4c70-b88b-1d9eed68d689/181473943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b6476b-b0a4-4254-a0e6-38bd75f16260/39641097276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea4d516-b30c-428e-be27-97dd58597275/24155600677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74ee496e-ad71-48ac-82c3-a5637ec9a8a0/peripiloxuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1367ed1-60cc-4025-818c-b8382c81dadd/vamugulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ad0433-f345-40b0-b8c5-447c549a0b3b/gibemu.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5356 bytes
SHA-256: b4977ce248791eced81b5a0d5be703378607a05fbb9eecfaadc3ec8cef1d1210
font_01_sfnt_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 11060 bytes
SHA-256: 7f0245822b712f8d62d332a6314b77cfad2553713ceea2b69eb8774a87bf83f1

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