Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa429df3c217412…

MALICIOUS

PDF

76.1 KB Created: 2021-05-03 07:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f2dbbf1e759b3a0bbb7acc390404069d SHA-1: dfcb40914956782d3dc1e2b27b14e4b0c1d0ddf1 SHA-256: aaa429df3c21741265e6800b5965990bb1d60e6312e957fbfa991c295003d1c4
126 Risk Score

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 0.9992

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://mezovuduw.ru/strik?utm_term=what+is+the+salary+of+bba PDF link annotation
    • http://doorstepcomputers.com/skewness_calculation336ur.pdfIn PDF document text
    • http://heartcenteredequestrian.com/play_free_games_online_without_ing_gtafo6oh.pdfIn PDF document text
    • http://kmikaerfs.ru/carbons_golden_malted_waffle_maker_instructionsifn9w.pdfIn PDF document text
    • http://jafilakawusuf.iblogger.org/11164597635.pdfIn PDF document text
    • http://forecast.bet/apple_music_beta_3._0_apklip2f.pdfIn PDF document text
    • http://padapup.iblogger.org/rikki_tikki_tavi_characters-pictures.pdfIn PDF document text
    • http://wapajojakazewi.iblogger.org/37012740597.pdfIn PDF document text
    • http://dukovasupufe.iblogger.org/attacking_network_protocols_james_forshaw_download.pdfIn PDF document text
    • http://katopikinu.22web.org/typical_and_atypical_pneumonia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovumakujibero.rf.gd/kelly_services_careers.pdfIn PDF document text
    • http://balesalefune.epizy.com/55502861671.pdfIn PDF document text
    • http://zepibugab.rf.gd/buffalo_lake_wisconsin_fishing_report.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/template_for_printing_return_address_on_envelope.pdfIn PDF document text
    • http://wusozugidiwe.rf.gd/52513348789.pdfIn PDF document text
    • http://tatasuvuputo.epizy.com/69913247365.pdfIn PDF document text
    • http://zofewodugap.rf.gd/41896028737.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/ableton_live_8_intro.pdfIn PDF document text
    • http://kebinuwozumen.epizy.com/xegojukadaroturetobalat.pdfIn PDF document text
    • http://pubometev.rf.gd/brand_collaboration_proposal_template.pdfIn PDF document text
    • http://vilulew.rf.gd/maeda_corporation_annual_report.pdfIn PDF document text
    • http://bibarixe.epizy.com/boishakhi_new_song.pdfIn PDF document text
    • http://nijetazum.epizy.com/fobedebipiwenajoteva.pdfIn PDF document text
    • http://faxaxesaxejov.rf.gd/zojutagodafukefu.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5112 bytes
SHA-256: be67f9aa4fcd24a751d957b475d73a3e2becd025969072582c59da5c3894fafe
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10700 bytes
SHA-256: 2ec5ed79e71f46ea084e4e9f34f26c4692719e6a93ec846af09907c83e968902