Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dc7b3795e612b8…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 17:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 64b177811c9df972e96457423c78d9c5 SHA-1: 6ef6f8d25a8f075baa4c12bee525108e2eb0186d SHA-256: 62dc7b3795e612b8d8d7afef1ebafbb2d980cbb7ff362fa2e868476dfb02538b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM'. The embedded document body, though heavily obfuscated, contains the URL 'https://traffnew.ru/strik?keyword=645+area+code', which is also flagged as an external URI. This suggests the document is designed to redirect users to malicious content, likely for SEO poisoning or phishing purposes.

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://traffnew.ru/strik?keyword=645+area+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468261/normal_5fa7639282814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369797/normal_5f8d9b1b8c3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5f95a04785ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_5fa2fb2db9e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f91323997af2.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/posewadotodipar-zukabosutig-kufuri-wepunizojepuded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f8e1ac5e3620.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/15b202b6-058b-4119-a671-a2f40609dd61/jesidewoxoperaxog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3578105e-fa42-4bb9-a919-5087af876e43/rockschool_guitar_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2da994-a78d-41e1-8784-c404f91b0267/4186087823.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/74066694629.pdfIn PDF document text
    • https://s3.amazonaws.com/vibove/most_expensive_airsoft_sniper_rifle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e82e918-4753-4f6c-bbbd-83140bad631f/gijoxemuzoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e04d05c-80ac-4c12-ae58-88fdee5435de/62910628293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca77a47-e537-43ce-9a6f-c47ec738340a/bihar_stet_previous_question_paper.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_off00006f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 4996 bytes
SHA-256: 01bf62b4641beb637ae5c329c4a475b05754fdf601770943d8bbeeb100c062e1
font_01_sfnt_off000080ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AC 10336 bytes
SHA-256: b592a18c9700e3668f39e0624aa1277f0c237db38494a01360549b50fbd659ba

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