Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c5a998d910c5d5…

MALICIOUS

PDF

82.2 KB Created: 2021-04-05 09:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1167991c0efdff4bdfd12a8227932b08 SHA-1: 70fb077344884e111dc1b6173b6d9d9116e34b4c SHA-256: 15c5a998d910c5d5f34dc70e9e78262ef7191a51198ba6119e91ce33ea75f367
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=foreign+stock+market+futures PDF link annotation
    • http://usene.xyz/72337558398ig1da.pdfIn PDF document text
    • http://iceteas.space/51631182257s5g74.pdfIn PDF document text
    • http://opensol.xyz/jamaica_clipart_mapcr0xi.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://benovezim.22web.org/flow_cytometry_report.pdfIn PDF document text
    • http://ourfanz.com/takovodojerut7fl.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/2008_civic_si_maintenance_schedulexlb4j.pdfIn PDF document text
    • http://9gusevshop.space/resiso9fan.pdfIn PDF document text
    • http://daddytestit.xyz/ankle_rehab_exercisesbzho4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupojakami/why_wont_my_air_compressor_turn_on.pdfIn PDF document text
    • http://tifofev.rf.gd/67946081592.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/3000_questions_about_me.pdfIn PDF document text
    • http://fugiwebagatikog.rf.gd/allahabad_university_holiday_list_2020_19.pdfIn PDF document text
    • http://mabazojow.rf.gd/envisioning_information_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/zozidijitofufudotozafij.pdfIn PDF document text
    • http://folijurojavagig.epizy.com/36711193244.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/bacteriophage_introduction.pdfIn PDF document text
    • http://nejojofumitob.rf.gd/essentials_of_strategic_management_the_quest_for_competitive_advantage.pdfIn PDF document text
    • http://luxexobaw.rf.gd/baum_compreender_o_behaviorismo.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_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 5188 bytes
SHA-256: f87e674c6ba9b664f31a26c0a9ccd0095bcb65a0aeadb82352279ecd25cae2fd
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 11732 bytes
SHA-256: 7cc017adcf6e667c12921e802c81c1f5a5ec332eab01ad7cd933534002002344

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