Malicious PDF — malware analysis report

Static analysis result for SHA-256 08efd64a80097e43…

MALICIOUS

PDF

74.6 KB Created: 2021-02-26 20:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c3c614d513081c4cdc5caca99d804b67 SHA-1: 23e3ef5410c6edec0dd7d0448dac062b5b5e61eb SHA-256: 08efd64a80097e43140ae944d32f037a018fc6dc63b3ec55339c1f72bf9df7ca
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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://crophysi.ru/strik?utm_term=search+google+classroom+stream PDF link annotation
    • http://davupopebuwiser.sportsontheweb.net/how_long_have_jails_existed.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/foxeba.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/what_is_place_value_in_math_1st_grade.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/blackberry_call_ringtone0cod8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483354/normal_6026eaf81b451.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/literary_theory_an_anthology_rivkin.pdfIn PDF document text
    • http://kernig.online/beresheet_spacecraft_trackerlch05.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/84851803099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5fca0574e9caf.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/78248755078.pdfIn PDF document text
    • http://dfwshootersupply.com/applied_behaviour_analysisihgwj.pdfIn PDF document text
    • http://gogotmif.space/tipepiv3mlyw.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/57947858208.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/90361197504.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/4550850255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_60001c3494adb.pdfIn PDF document text
    • http://matteset-spon.space/argox_cp_2140_pplb_drivergptjt.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/bewibiwat/careless_whisper_fingerstyle_guitar.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_off0000c9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AA 6552 bytes
SHA-256: 904cdca74de982aeabbc792a7d96e3414fb906509098b2b73ce1df8453b4c4b9
font_01_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 5316 bytes
SHA-256: 86cb751cb8f23715e2db5ce434201be4c554755417748b51e31b6e7b5e2de917
font_02_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 13708 bytes
SHA-256: 801075745475acec6a902ff3cb848b50d58149c9f8fc4b9549b1fe4251a9e573

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