Malicious PDF — malware analysis report

Static analysis result for SHA-256 6827989d73595fb7…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 21:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 97166cd1cdb865e69266ab6ece94b5cf SHA-1: 74205b9118bc033adde13c8a9e90ef78431997ea SHA-256: 6827989d73595fb7b8bc618f65d3d66cb88ccd13b4caf7d34abdefc939e4d789
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. This is supported by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of numerous external URLs points to a potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/award?keyword=ahu+hvac+system+pdf PDF link annotation
    • http://fewomazojuxed.iblogger.org/bestiary_1_pathfinder.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/81b68.pdfIn PDF document text
    • https://varepakizadi.weebly.com/uploads/1/3/2/7/132740548/3168827.pdfIn PDF document text
    • https://niloberu.weebly.com/uploads/1/3/0/7/130739427/sedebebexufifadulav.pdfIn PDF document text
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/a5354e57b18.pdfIn PDF document text
    • http://kernig.store/what_are_the_unidroit_principles_of_international_commercial_contractspm7ye.pdfIn PDF document text
    • http://idealicacolumbia.site/psx_emulator_latest_version2ui2s.pdfIn PDF document text
    • http://getyourscore.info/21875071830sys5v.pdfIn PDF document text
    • http://baltika-trans.ru/vimaselanunemaponicjccc.pdfIn PDF document text
    • https://mugevodotigo.weebly.com/uploads/1/3/0/7/130740084/dupar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulomalizekuvu.rf.gd/xofatibifepaxim.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_fa2e10967bdf482bb98661a18e2d2f66.pdf?index=trueIn PDF document text
    • http://kelawezup.rf.gd/how_to_configure_netgear_prosafe_gs110tp.pdfIn PDF document text
    • http://vimomata.rf.gd/autocad_electrical_download.pdfIn PDF document text
    • https://09ec27ad-13b2-4d6a-9bba-a73d40af2dac.filesusr.com/ugd/309646_24327973504144c9bbaf7ea303f5169c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/555a6b6e-4cd6-4a56-8bb2-af1565716863/how_to_make_right_with_god.pdfIn PDF document text
    • http://sanebofav.epizy.com/bsc_magazine_download_free.pdfIn PDF document text
    • http://pojuzuduxotazup.epizy.com/amitabha_sutra_pinyin.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_e1d764f831ff429fb8b229e70f24cdbb.pdf?index=trueIn PDF document text
    • http://figapow.epizy.com/airframe_and_powerplant_license_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8276169-97f6-4de5-b5f0-ed787b856d14/how_to_clean_a_smoke_machine.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_57a72ae6d0de4befa7956c3fb9e30300.pdf?index=trueIn PDF document text
    • http://buxodanukesidup.epizy.com/video_editor_for_instagram_stories_android.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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5420 bytes
SHA-256: 252e84d777e4310920d983efd9e5826dc36f723aa1e1fff867522ea861af7907
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 10984 bytes
SHA-256: 5c591779489327bc6be18ab4e5c3684cb5cce39d96e7a3327152967232ecfd2a