Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7bb6976dcb0e7e…

MALICIOUS

PDF

63.8 KB Created: 2020-12-02 07:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45fe85b4d352f4bdb0d584aa3d349100 SHA-1: 81228c7bef7d8324cbdb1d08ba95f5308e82acd9 SHA-256: 4f7bb6976dcb0e7e37dde5d6f4e3dfa0ebec31c5cc725b2903593dc0d03e46c8
244 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. This indicates a likely attempt to direct users to malicious content, possibly for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=jacksonville+jaguars+injury+report+week+2 In PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/nafasikegokakebexo.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/gesajoledufujem_zudowimiwaxozuf_vevepalu.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/7490955.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/64273050d6a79fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fc0d5d45952e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f99993d861bf.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/9307520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f89cd45b6cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5f9c63891db85.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/9441427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d87e31338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5f97632e9968a.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/4e0e1a29-5321-4076-b503-c1bee8c4bfc5/moxigagurebusitosagaku.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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 5616 bytes
SHA-256: 7800a851fe7e867279117937435acee87b3f79d6ab4861631d28209f5fdd154a
font_01_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 10628 bytes
SHA-256: ca6c667a8929fb9281c19b2e9da98ede387068aba4e8aaf9944d6099324c45e3

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