Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec5afd6dc229d10…

MALICIOUS

PDF

78.3 KB Created: 2021-03-29 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c17bc8d59108c58c7ac5d5e4b7194dc SHA-1: e7d498c3de9448dd021a7e3dc25eb8f2eab7bf10 SHA-256: 3ec5afd6dc229d10b58da2840293d4085c27a41590be5285d405b785ae9f51ae
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 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=how+many+bags+can+you+take+on+allegiant+air PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474978/normal_604a176322ec4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fca254086db5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5fe9a86fe59e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474457/normal_5fc5a7dea0c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_5fd1fe23166eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447086/normal_5fdc10da28430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5fcef478cf9f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422163/normal_60002485ea52f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_60183498ec174.pdfIn PDF document text
    • http://ridegibulas.22web.org/certificate_templates_in_word_2013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5ff209ab9e89c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_60372fa4e9345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_600b928dca05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_605109ad9ac63.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/d720638a-7a0b-4aec-ab49-d63d20bbcfde/sowilolapitotu.pdfIn PDF document text
    • http://kejarajavamoge.epizy.com/best_application_to_movies.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/nhtsa_sfst_manual_hgn.pdfIn PDF document text
    • http://jirunadufed.epizy.com/hirayama_autoclave_manual.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/sevimuduvumubiwukimebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba0d2b72-505e-4e2c-b6cc-fd6b9d95cfc5/air_force_one_movie_director.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_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 5476 bytes
SHA-256: a027fadcda331db5216987db0c0c9231603487aa52f6e1b41f4d1c12489e4a48
font_01_sfnt_off0001052c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052C 10788 bytes
SHA-256: eef0dd21c65a3a9328a383e6629eef74964cc1a81d3c2a18c2a5567841e4ce68

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