Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7eae0aa270e323…

MALICIOUS

PDF

92.5 KB Created: 2021-04-26 20:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bdaeb9fee61584ccb561a37a1603f53b SHA-1: ead7e0a381f2d10bd2130d6e28dec77a7ac7f2be SHA-256: 9b7eae0aa270e3236925dfc25fe9da907040aa48f001b36e7ab36899f162deb3
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 0.9998

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://midufefew.ru/strik?utm_term=how+to+make+edm+fl+studio PDF link annotation
    • http://kismyketio.com/slow_motion_video_app_android_freeljj83.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/idiejeV/87433886674.pdfIn PDF document text
    • http://toportt.online/what_is_a_primary_characteristic_of_a_feudal_societyxhj0b.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/bxidbhi/santali_cartoon_comedy_video_2020.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/8_characteristics_of_life_biology.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/e5H35Xd/ethiopian_tvet_strategy.pdfIn PDF document text
    • http://health2health.online/xijurgk4yj.pdfIn PDF document text
    • http://fitokaps.xyz/bifufakizedoxegubogpws6c.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/ahigiUo/zombie_hunters_2_ps2_iso.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/pagumur.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/habiehe/45127506500.pdfIn PDF document text
    • https://cdn.sqhk.co/rujosupatebu/UN8Fthg/battlefield_bad_company_2_pc_apunkagames.pdfIn PDF document text
    • http://o-karte-kopilka.com/97775812894pcb07.pdfIn PDF document text
    • https://cdn.sqhk.co/xenojepezere/nhjha6o/game_voice_chat_app_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_c9d9d5d0480148cab83917ffa9acdb3e.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_e634cf6cc904488984f5efd5bd1328a3.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_5be4990f9bdd4384abefd7731ed4aa8f.pdf?index=trueIn 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_off00012c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C23 5076 bytes
SHA-256: b554ef7cc6a5e43b7f301ec3732ba756b956b90be2ea3fa288bc8a5e3116615c
font_01_sfnt_off00013d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D67 11132 bytes
SHA-256: 40b387c61a1d05bcac8bd0d41e309bc169b875e2382c6645e92f8f38d912549e

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