Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d928b5689c96c80…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 16:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d3e91a4686bd6faa664cf00da0536ae SHA-1: 1d7611391e2a598767b5753f8a97c36d90455d5b SHA-256: 9d928b5689c96c80857a4195ea3f0716e9a61d9a050484be63f84e117f4e272f
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://bologen.ru/wix?keyword=physical+science+final+exam+study+guide+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475852/normal_5fe56bf12abc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_603f31fc30767.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/9lsighg/logewum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_60257bd6c3b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5fe977eebc348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_60344340d442d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5ffb641043a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_5fd8c104caed8.pdfIn PDF document text
    • https://cdn.sqhk.co/vuveleni/jethg6R/run_race_3d_2_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380543/normal_603a23768f30f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_1d8f7c1114f24b5c8f6189f28fd6821a.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_2153a60cd26c44689ca5d4abaa306acd.pdf?index=trueIn PDF document text
    • http://gajopule.myartsonline.com/mary_poppins_returns_cast_now.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_get_the_average_atomic_mass_of_an_element.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_3b14cebdbd94468dbc5482ef29be61e5.pdf?index=trueIn 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_off0000e2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 5992 bytes
SHA-256: 4d2a9729c22ccead68bfaaf731c947e899accd236576f948a0d52e0b5801a0ee
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 11120 bytes
SHA-256: 87ad013c07ea83dcc19f05d1c5986af17e4b820e5b0fbd923934f9eea7bf2d83

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