Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d88491c1e5081d3…

MALICIOUS

PDF

85.3 KB Created: 2021-04-03 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 709a49f1c9f6ba1d0a761426220c2df6 SHA-1: ec9cb585f04be7c83a5203005b1476b2a00e30a2 SHA-256: 3d88491c1e5081d3fedf6e2d845e11265affafe83bccf75f02b9e52947758e88
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dugedepap.ru/award?keyword=descriptive+writing+outline+pdf PDF link annotation
    • http://idealslimitalia-ufficiale.site/ff9_walkthrough_downloadnvw1n.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/TT9idij/bird_landing_on_head_dream.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/QQm4vjd/86434687587.pdfIn PDF document text
    • http://veduxaze.iblogger.org/30250873329.pdfIn PDF document text
    • https://ziwivebagojub.weebly.com/uploads/1/3/1/8/131871618/panesejuke.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/jezifilozozufaj.pdfIn PDF document text
    • https://ravixibede.weebly.com/uploads/1/3/4/5/134584659/8413680.pdfIn PDF document text
    • http://biomaniks.website/karate_kid_2_movie_in_tamill1uwb.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/wifgjVg/20718995909.pdfIn PDF document text
    • http://mofolaz.22web.org/karebagixamimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_551021a98c534b26bada037eac048812.pdf?index=trueIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_4131b2ffb3bb4da09e4edff3d3a26621.pdf?index=trueIn PDF document text
    • http://bulijisir.rf.gd/blade_runner_2049_imdb_parents_guide.pdfIn PDF document text
    • http://zavimefetemif.epizy.com/3269770320.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/adobe_audition_1._5_free_windows_xp.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_4b528bce5f2b4958a06bd8e3232ff84c.pdf?index=trueIn PDF document text
    • http://gisaxuzarufol.epizy.com/16740513409.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_ddac7d67f8f94103bbb3eb3715d608fe.pdf?index=trueIn PDF document text
    • http://jubidak.epizy.com/alaska_drivers_license_renewal_form_ontario.pdfIn PDF document text
    • http://rimamosapike.epizy.com/frozen_hot_chocolate_dunkin_donuts_carbs.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_off00010f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F03 5264 bytes
SHA-256: 4b6d9176b418629919c249289e3ea0341f638e08983f67cdc3cb72e2113de99c
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 11508 bytes
SHA-256: cad2711cecc2f8667eb0019de27942cff4a9c5b64d4a0e8a654923593998488c

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