Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fed5d7eb0d24761…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 10:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31b4ec66b6027ceb861a85a51d999549 SHA-1: 95094c7af98aaef04b7a44e9f70c91ea1ab1c239 SHA-256: 5fed5d7eb0d2476127791de2dda8564ca2f10041e16a781202d1021477bc1fd8
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://maypoin.ru/wix?keyword=54.+energy+crossword+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602665969d991.pdfIn PDF document text
    • http://byt-upak.ru/fusilonoxudujepa43p4p.pdfIn PDF document text
    • http://vnds-super.space/bilimsel_aratrma_yntemleri_kitab_pegem8ffey.pdfIn PDF document text
    • http://yogait.space/371447403818ui48.pdfIn PDF document text
    • http://logvoz.ru/movajetumanunuj4ieh.pdfIn PDF document text
    • http://instasurprise.online/40667877334y6p5r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5ff1c09674365.pdfIn PDF document text
    • http://thesalle.xyz/ar_quiz_answers_for_harry_potter9djgy.pdfIn PDF document text
    • http://dektesheff.xyz/walmart_ps5_gamespot8s317.pdfIn PDF document text
    • http://kersita.fun/what_is_the_best_motto_to_remember_for_universal_precautionsdiz1d.pdfIn PDF document text
    • http://wide-take.top/hacker_mod_for_minecraft_pejtq66.pdfIn PDF document text
    • http://ctyr.ru/609771197386t6fi.pdfIn PDF document text
    • http://starconflict-game.ru/40748725424jdoiy.pdfIn PDF document text
    • http://keepqifi.space/dewetjv11m.pdfIn PDF document text
    • http://autocredit.moscow/tiwirijepuer60t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_fd8e44e66c494777aa0eb9b18b9159c0.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_eab3c67e163b4f51bc6d6ebf9e86e85f.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_edadf9b05fea4e23a0957a6733764c7c.pdf?index=trueIn PDF document text
    • http://pupusebeleba.rf.gd/ginifivavafefebubab.pdfIn PDF document text
    • http://nuwikomoxiso.epizy.com/aeroneb_professional_nebulizer_system_manual.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5420 bytes
SHA-256: f341f999a7634dd2bc46805dda87113f86e3246ea5e9c6e1b3cf287d9e170b65
font_01_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 11060 bytes
SHA-256: dcd4c13fb146abc6fb176b56411fc181a419ab934c4ca68c239a0e08d1313537

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