Malicious PDF — malware analysis report

Static analysis result for SHA-256 c462776bb2c82a47…

MALICIOUS

PDF

83.5 KB Created: 2021-04-11 20:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9de20dec4e10c1858e7b94edd96871c1 SHA-1: b13c22a5198301642295bc74c7ff67377fef12ff SHA-256: c462776bb2c82a4755d1fd5d2351aae1bc41d0794b71255a0aaefeca218d2cde
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://lozipotod.ru/strik?utm_term=hp+officejet+4500+printer+installation PDF link annotation
    • http://geesecam.com/buwegax2sa15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5fda4a5846439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_600c8dad3e623.pdfIn PDF document text
    • http://straponartist.com/pakemegigezokonjxehz.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/molagokinetalirekijemabo.pdfIn PDF document text
    • http://mobile-media.moscow/95696230963ynfse.pdfIn PDF document text
    • http://persequen.com/helicopter_mechanic_salary_ukjsnbn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_6010c553b949d.pdfIn PDF document text
    • http://idealicaitalia-official.site/wuwifudevor7azoe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_603b27d89f658.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/275a7013-b21c-4a13-939c-de6f66ac5e7e/tojom.pdfIn PDF document text
    • http://zibevili.onlinewebshop.net/company_portfolio_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa853dba-42b5-431d-8a7d-e67af2f540ec/xatapano.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/faria_depth_sounder_wiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a4ac19-e117-4415-856e-f11368ffbbd1/wezotaxadov.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/nuxedopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe800e7-d0fb-4f1b-9347-8ec1373bbfa0/kemper_profiling_amp_vs_powerhead.pdfIn PDF document text
    • http://lugifer.onlinewebshop.net/bosch_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/61714654321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea719d0-1d04-4478-9b5d-a12c498d193d/7570043422.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/55922526331.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_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 5400 bytes
SHA-256: 41eaa956cf43b6a4c49d727c29d78b5b600dbc4071e4c6d2f2d991d48ccc3952
font_01_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 11124 bytes
SHA-256: a06231f118b45dc3c473e94a9786d7486d458c8e6f2b2121987ffba1e0f21da4

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