Malicious PDF — malware analysis report

Static analysis result for SHA-256 8123a8dbf139c7c1…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 12:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e304e2aa8799d16a9aa0bdbfc74fde4 SHA-1: fab8dd9f28e4b3be80d0f919904ebe79590d21c0 SHA-256: 8123a8dbf139c7c1e4270f87bd78340ecc360d280b6051ad3a7440542a8a3380
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 0.9998

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://botokaw.ru/123?utm_term=list+of+physics+formulas+class+11+iit PDF link annotation
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/1651615.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/sex_education_season_3_release_date_countdown.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/57600468259.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/ridgid_air_compressor_model_of60150hb.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/ghXgfhd/27640824435.pdfIn PDF document text
    • http://steh-sistem.ru/gafozifasamirozijebanz2pg3.pdfIn PDF document text
    • http://avit0.cc/6874481227439l8j.pdfIn PDF document text
    • http://top-shop-store.website/dell_latitude_e7450_i5_5th_generationbao19.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/fitodinunedugubovezafok.pdfIn PDF document text
    • http://koprovk.xyz/the_shape_of_things_book_videopzvnv.pdfIn PDF document text
    • http://radanews.site/autobahn_police_simulator_2_apk_androidvex4g.pdfIn PDF document text
    • http://timelessdecorum.com/2016_dodge_durango_owners_manualu61d2.pdfIn PDF document text
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/e2e53160f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozimape.onlinewebshop.net/hunters_hunted_achievement.pdfIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/leica_m6__m7.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5348 bytes
SHA-256: 5f2b94649b558cb402393145c00c527878f7735af7cfb7b101e75968ca323d63
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 11548 bytes
SHA-256: f2a70bcb36d82d76e75a08a5ca47f539771825592416772718d95bde689036c0

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