Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c99a556d7c71b5…

MALICIOUS

PDF

44.1 KB Created: 2020-11-08 01:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdb2bc2517c83f441386771542ac8386 SHA-1: 8265907e80ff3a87ad7704fe8eaa81c13937be8c SHA-256: f0c99a556d7c71b5f665bb08f70064c7183d60d6d76aecc7fe84d7b3358f7928
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/aws?keyword=article+review+example+mla+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462339/normal_5fa5fc10d271c.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/8ad9c55f-b7a6-4e3a-bcdd-984e3740a199/pisowefujejo.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/showbox_official_site_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8cfce7-fb73-41a1-8557-42f2664f0bbc/49106918341.pdfIn PDF document text
    • https://gigevuko.files.wordpress.com/2020/11/98575612039.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/minthe_greek_mythology_and_hades_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59fcded-ebaa-4f63-bf52-31052e9842f9/75900076294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c62a8e-5bf8-4889-8906-03cf8cd0d9c1/town_of_duxbury_beach_sticker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577f10e0-85fc-4dd0-9aaa-72975829ab07/18965546842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab844a63-8ab0-47e8-aa6f-f36cad1ac84d/juwapurutiwotewuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3be7cdd-54aa-4135-b5a2-a757f134cd47/tojuremitesoxuravurog.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_off00006f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F30 5192 bytes
SHA-256: 8feb12642f587f8480cfc256805823c295cc7745ab63c342e185e8c096951eb0
font_01_sfnt_off000080df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 10192 bytes
SHA-256: 8799f80437c20941e959c20fde004ba7bcc97699bb239fbe296d4402c2915f5d