Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68c8e2713779274…

MALICIOUS

PDF

60.6 KB Created: 2020-12-10 09:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5176b5e38d1ca18e38798f78f318a3f7 SHA-1: 9170a4178f6a0c7bc7f8e3dccc194095d9d870ad SHA-256: f68c8e271377927409d1a0469987b6a92e2185209f6bd78e21144385b192f5b8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and ClamAV, indicating it's designed for phishing or hosting malicious content. The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. While no scripts were directly extracted, the presence of external links and the ML classification suggest exploitation or redirection capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=business+card+templates+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fce23e1965d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_5fbf242ff4212.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/9512328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5f97a9e2c4aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fad54a92a0b1.pdfIn PDF document text
    • https://buzowoxeferoxo.weebly.com/uploads/1/3/4/6/134662453/bagebanine.pdfIn PDF document text
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/luxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5fb9274da4ed1.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/d2cd6a64-9153-4e02-93b6-8afb645c5596/labalirokefudakumetowato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d24b53f-f942-47b4-acd1-aeb30f1ae9b3/initialize_a_double_vector_c.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/chaar_sahibzaade_film_3gp.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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 5348 bytes
SHA-256: b072036138e05f2918038b40f39934c0b8ecd71e861b05e7e330cfd88c0a7f26
font_01_sfnt_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 9784 bytes
SHA-256: 936130df2a80f13021e6fee5b83e7244fc08973ff7b189b5dc97feb7696c207d

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