Malicious PDF — malware analysis report

Static analysis result for SHA-256 871b3e322ca8570d…

MALICIOUS

PDF

68.7 KB Created: 2020-11-12 17:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bf3f8aa8303e5fd867b83335b5563b1c SHA-1: 9687ad598bba3da8a35c581442fcb510f398e8fb SHA-256: 871b3e322ca8570dc2acf80cce2816be0de0b391e1279ce319b2c0a7c8aba7f7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=vizio+e+series+tv+manual In PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/xutef_dikak_kobinakafowumi_tivaguxulep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fad3bae7a237.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://s3.amazonaws.com/kudufigunabi/76537114574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91d80c2-0f22-412b-b2a9-2661282a770b/18287775712.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/38854612585.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/chrome_older_version_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df2d31e-def0-49b8-bf2e-c2336dae7583/46840928447.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/82903372731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f16e319-ab88-4b1b-b11d-111e145135a0/92620358711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e34100a-3962-4fe5-8455-e30fd594f4ab/emt_medical_scenarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594de520-6f37-474f-9157-b49e2061fecc/rugijifonikugegafatal.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_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 4788 bytes
SHA-256: 428bdf0ee8787aff6dac9e3e638c7ad18564f9e050c60a0b28a59ba16e088784
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 10848 bytes
SHA-256: 820ba1898b1da4cbf6939b5f2044588f2193dddf1d7625d3a1b97f6f7c739265
font_02_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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