Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfdcb729edabaca…

MALICIOUS

PDF

70.6 KB Created: 2020-12-27 15:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 78bca06eae91b15d997cd242b05ab25e SHA-1: 7016281f8206e9e8efdfd42c95faa762e5988a01 SHA-256: 5dfdcb729edabaca6ec236d502312b6694eaaeea81cc0738ffb1c1c9f8f3bc82
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for obfuscation or redirection.

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://traffnew.ru/aws?utm_term=ewg+laundry+detergent+guide PDF link annotation
    • https://cdn.sqhk.co/nerenina/Oy8hjzt/45530823861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe82cbbdd6b2.pdfIn PDF document text
    • https://kobijetiva.weebly.com/uploads/1/3/4/3/134322382/b18ff.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/cea7d9440e.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/kfhbR5T/gestion_des_risques_dans_une_pme.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/mogurowib.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/QPtjfDl/46161734728.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/jigihgd/logo_quiz_2020_answers_level_13.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/6684234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fbb37124be57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/397f6602-148c-4fc6-ade6-295995f6c286/wuwotanibegubejovogis.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/agile_roadmap_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09fed3eb-1152-4d03-a459-3bfd63a31a62/57594147386.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 4736 bytes
SHA-256: 2a46e98f558beebd5ad57c9509148d6b4b1e34a784fc1cb6dd4b96f2d99dda48
font_01_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10344 bytes
SHA-256: 8fd96a4f0da21254c31eff274e4606ee17964cde9ce8c9ac8c16f0616fddadb4
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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