Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6d7d3344aaad12…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 10:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8f8cd0b684ada323ab5c35517bd18a0c SHA-1: 5abe576b0e17020aaf5e4e4c30d9f33608587f89 SHA-256: 5b6d7d3344aaad12fd4aacb5917dae2b872798cd73e89b80a98f5cf7ac7fbfe1
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-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://seumenha.ru/strik?utm_term=netgear+wireless-n+150+router+wnr1000v2+firmware PDF link annotation
    • https://cdn.sqhk.co/bomunerafoju/eQ1agdU/three_kingdoms_mighty_super_hero_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/bP00Ynq/vabokojilosesuxiju.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/sjisieR/online_quiz_project_report_in_java.pdfIn PDF document text
    • https://cdn.sqhk.co/sawibevas/HjiXgeS/xokevimajazejavo.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/ejbgcgN/36147397154.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/ajicIhc/rorisupemowubimobuwuji.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/jcjbWgc/cornell_note_taking_pages_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gigepiwej/xidLHjg/file_transfer_android_app_via_wifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_1904ea98ce4c44d6a902b47bd0b0ffac.pdf?index=trueIn PDF document text
    • http://nisinukodepafix.rf.gd/cambrian_period_ep_24_eng_sub.pdfIn PDF document text
    • http://vefejabenu.rf.gd/pathogenesis_of_hepatitis_b_virus_infection.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_d39d21daa46b45c4b572cf7ddf8aedd6.pdf?index=trueIn PDF document text
    • http://juxudawalugevop.epizy.com/pengertian_atonia_uteri.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/capital_gains_tax_kenya.pdfIn PDF document text
    • http://duponinet.epizy.com/cisco_sg300-10pp_default_login.pdfIn PDF document text
    • http://kofufinaniba.rf.gd/demon_hunter_leveling_guide_wow_bfa.pdfIn PDF document text
    • http://nupakavidowux.epizy.com/14303319428.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_e1108acd72d34aaa8933091103b98871.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_ef45d9da5be342d8b3631bfe54ae9ad2.pdf?index=trueIn PDF document text
    • http://xovafufu.rf.gd/xijekagexux.pdfIn PDF document text
    • http://remekos.rf.gd/85225017825.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_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 5692 bytes
SHA-256: 2db6663064b00e726e11d19490d05a9ae0db11db5e54d508321f6dc22d13ac63
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10896 bytes
SHA-256: 4045882e3ef40f648d4aefdfa0785468e470e5e5d6e047dcebf8515c29dbdc31

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