Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09355492d5a4f00…

MALICIOUS

PDF

76.4 KB Created: 2021-03-06 02:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 648035f336d85ef88e04f661dca0dbf6 SHA-1: 66432e3f8335d9916e1ca0c2874f13397b428ac8 SHA-256: d09355492d5a4f00d55cfc6492efae59e101f6630c9410ee50b79a54a2510f3c
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 0.9999

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://xajibur.ru/wix?keyword=truy%25E1%25BB%2587n+ti%25E1%25BA%25BFu+l%25C3%25A2m PDF link annotation
    • http://tokesuditetu.getenjoyment.net/what_are_the_negative_impact_of_globalisation_in_india.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/96601746675.pdfIn PDF document text
    • http://puxefesezosowej.22web.org/xiwowemurokeg.pdfIn PDF document text
    • http://detonic-buy.website/pokokuxgp73v.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/favemoxobes.pdfIn PDF document text
    • http://detonic-italy.website/best_idea_groups_eu4pjm3b.pdfIn PDF document text
    • http://zereteleriw.getenjoyment.net/poxegebotiruvasevapaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puribisipup.atwebpages.com/sansui_television_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbdf4e1-b09a-4e44-afcc-e9cf34212ab6/chrono_trigger_snes_cartridge.pdfIn PDF document text
    • http://kapigazezej.epizy.com/how_to_assemble_excell_pressure_washer.pdfIn PDF document text
    • http://kazaxese.epizy.com/71457089172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c736acaa-dfbd-4acb-8d05-9ed6980447f7/qual__o_campo_de_atuao_da_psicologia_organizacional.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/99286017314.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/celebration_of_life_announcement_template_free.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/71635057313.pdfIn PDF document text
    • http://nabunuwo.epizy.com/34393726637.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/3325768119.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/joint_variation_word_problems.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_off0000e27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27F 5072 bytes
SHA-256: 2ea0057ceb002e824ab9689a8371f7c1cc31f692211abab277d71545c481b60f
font_01_sfnt_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 22208 bytes
SHA-256: 171be75aa7082bddc8ee430d45576863e7a6cb4892975a311c8f3e3a7a32b287

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