Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf55e7811fe1b7b…

MALICIOUS

PDF

73.6 KB Created: 2020-12-29 19:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e6f8298db61e1d05942d25ba811e4e5e SHA-1: b7591d36660aeb59d2c51f0a87f42ede615c54b3 SHA-256: aaf55e7811fe1b7beef4819e08f4ebf910b0e80d52a06d04b99cd92f8875809c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

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://trafftec.ru/strik?utm_term=game+for+cats+app PDF link annotation
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/soxapob-kenigokijaz-nafogenu.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/c935c626418.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/f8b382ae5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fb6ea1e28c58.pdfIn PDF document text
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/3038033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fe762b099511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fe76c3e3c9c8.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/damevusom/84821879909.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/kujejekusepuzorekez.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/destiny_2_zero_hour_heroic_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/18015548266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ac40b8-66da-4c7f-8fa1-5724aff71163/demon_eyes_kyo_episode_1.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_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 5160 bytes
SHA-256: 831858f8c119c57ec1780495d737c2bc0c51baab98c5763e2ce3947b9b99e165
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 11576 bytes
SHA-256: e68d0cd44ddb6bea8a05bd866a195486408d8d80c10405951136aa82901f208d

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