Malicious PDF — malware analysis report

Static analysis result for SHA-256 263c5ed10f3012ca…

MALICIOUS

PDF

69.3 KB Created: 2020-11-13 02:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ef7b62a83b4bb32f7c64bbc92b1983fb SHA-1: 11096c1f53c047b7bb1797e39713ca73d4006bec SHA-256: 263c5ed10f3012cab69d02a6a44f5976f0922ff8fe0f22224cd821afb44a243d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file, disguised as a cosplay tutorial, contains a large number of embedded external links, many of which point to potentially malicious or link-farmed content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=wonder+woman+cosplay+tutorial PDF link annotation
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/ec6403d8c7f.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/kawotexulozax/47444227148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fab4cd-7ee9-42e0-b791-85566f2cee1e/bupuwo.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/20041529239.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/67686283397.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/bitilajobijazasaxevev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95612b92-0993-4819-8008-0a03fe0e9037/xipok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d93d28-4fdd-41ce-b3ff-fbf05bcbd359/97496051126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604b2055-10b0-4600-a50c-40383d21fa88/car_park_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb7b58-7bc6-4e0c-9fb2-31775b221724/detovudugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb55e7a-6c2d-4976-98f9-49ff02ae6a6e/yoshitsune_persona_5_royal_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcf649f-c5e9-4d6b-a08a-39a3a542fbda/37195853922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428f0729-b0dd-443f-b349-5983e165a193/tixugokoxixokinawegarup.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_off0000cf70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF70 5428 bytes
SHA-256: c80493e3787adb80f2ecfd2920d0e020ca18a45a68845393f35fe320345bd889
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 10856 bytes
SHA-256: 392b132843bce873354d2290ca6e672331208e1ccb2924b74bec6b4673fbde39

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