Malicious PDF — malware analysis report

Static analysis result for SHA-256 162d8eff67470210…

MALICIOUS

PDF

77.2 KB Created: 2021-05-19 06:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f103edd7fe4886edcedf9c679db5f1c0 SHA-1: 751a9f61a7ffa02b17ca692ef9c48b4b5c3b4adf SHA-256: 162d8eff67470210388d85af9d694922e4eaa93473e24adcc43df4fd423f322a
156 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 0.9997

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
  • 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://jumiwimov.ru/strik?utm_term=can+you+refuse+work+because+of+covid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412591/normal_60380f8145d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_605700fa74168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fe86971dcc69.pdfIn PDF document text
    • https://garovinarabibaf.weebly.com/uploads/1/3/5/2/135293384/004fccc6b815eb9.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/lemizewofobon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_5fe99699b802b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_60563da105951.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/e6f6b3b83fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6057bb94b6a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390074/normal_6058b41ecd47d.pdfIn PDF document text
    • https://nobazivikiva.weebly.com/uploads/1/3/0/7/130776215/fadojazirefax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_601fe201ee069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_601dbec227449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/basic_mathematical_functions_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/aylmer_quebec_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/coleman_powermate_5000_generator_air_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/medieval_2_total_war_unit_models_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/minecraft_combat_handbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/filad.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/xunedetemo.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/nibafexu.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_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 5348 bytes
SHA-256: cbddd2e2598ee006a8a0787ad0dca3f4c5b6ddfb4ff4a42d155cf3dcd06d3c60
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 11052 bytes
SHA-256: 6f7d34ff635130e1b0cecf411b9a04ced46fc4bbac84350450f2ddcb51b5c4a5

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