Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4617c02ef3e054…

MALICIOUS

PDF

76.0 KB Created: 2021-04-03 05:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6bb69e37166742a5198a3f1e6f7d92e3 SHA-1: 5e5181aa77cf4aa3dee43b0bc98bd1517ec8d594 SHA-256: ff4617c02ef3e05452e57bc4232f2c566cf38b55a423d8f92fd9f1b6578ab081
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/123?utm_term=2+digit+addition+no+regrouping+free+worksheets PDF link annotation
    • https://cdn.sqhk.co/xiladuxe/fO73hgd/arcade_games_for_sale_edmonton_alberta.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/AZQUthi/kaduki.pdfIn PDF document text
    • http://gibelepij.scienceontheweb.net/jamijomegasarekosaz.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/dobeboduwajunogitowod.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/ihj7Pji/best_football_game_app_2020.pdfIn PDF document text
    • http://idealica-tufficiale.website/10809119718ywwaw.pdfIn PDF document text
    • https://bunadijora.weebly.com/uploads/1/3/4/4/134432215/6813472.pdfIn PDF document text
    • https://gixatupugibezi.weebly.com/uploads/1/3/5/2/135296842/1274817.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/lg_ductless_split_system_tech_support.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/nextbook_ares_11a_manual.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/red_cross_first_aid_kit_list.pdfIn PDF document text
    • http://oneshops.space/azar_app_hack_apkamlt9.pdfIn PDF document text
    • http://adminhalil.com/xalukitasiwitorjlikh.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/p9jjrje/digital_marketing_certificate_cornell_cost.pdfIn PDF document text
    • http://lnstagaram-verifiedbadges-from.com/school_magazine_cover_design_templatest1046.pdfIn PDF document text
    • https://cdn.sqhk.co/kogeledewafo/oN1USgc/nuxikusarojatijofo.pdfIn PDF document text
    • http://urott-hu.com/didosukisivanikuzogajjsckg.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/gapawemaguti_lojeruti_tegat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lifobem.myartsonline.com/53447516145.pdfIn PDF document text
    • http://bavufupuvamopaf.atwebpages.com/80074984310.pdfIn PDF document text
    • http://jotudokizer.onlinewebshop.net/tofuz.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_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 5464 bytes
SHA-256: 36bb0e685232883fe721914bc42a96da71a946304c2c2e2d523bdf266f3ad8d5
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10992 bytes
SHA-256: 0dcd79f1c90d9c244ab65de21e7f97680b434743ca29c5de07d39bbefb52ee6b

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