Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5ea129a8121c1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-09 04:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 86a44148de23648b63c5bc06930c8041 SHA-1: 1eae44ec1dd23c567503268df80117f4b421bd40 SHA-256: 85d5ea129a8121c123755d9f1af3af232e7fb6b415fdd5b73b3b1f304baf2dbc
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://seumenha.ru/123?utm_term=nhs+weight+loss+surgery+guidelines PDF link annotation
    • https://cdn.sqhk.co/lobinazema/jglhhcM/bovarilubatat.pdfIn PDF document text
    • https://cdn.sqhk.co/viposaxa/jgWiggj/22416739878.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/7iaIhWh/digi_honeycomb_login.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/4Cjgjgr/d-_men_the_defenders_guide.pdfIn PDF document text
    • http://xebubux.sportsontheweb.net/76912790663.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/wipefarodutepafafefoxi.pdfIn PDF document text
    • http://waxadod.22web.org/conflict_job_interview_answer.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/victoria_secret_pink_phone_number_customer_service.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/wububabemimafolaba.pdfIn PDF document text
    • https://fileduwefevara.weebly.com/uploads/1/3/4/3/134384607/zateruzomeba.pdfIn PDF document text
    • http://fabunek.iblogger.org/zamutuwuxege.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/UhbYieb/tabletop_arcade_games_for_sale.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/e2a2a51172f09.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/mapepujamodujiwewazofo.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/xapasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kapirexazi.onlinewebshop.net/vexodozilo.pdfIn PDF document text
    • http://dezobod.onlinewebshop.net/skyrim_how_to_join_the_dark_brotherhood_who_to_kill.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/how_to_open_preferences_on_mac_with_keyboard.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_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 5040 bytes
SHA-256: 80d755a7cbec47fb603d1c9049b6c0b6de25b561dc5cf184c74e5554be824d3d
font_01_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 10688 bytes
SHA-256: 14baa7970c2cbb389035267d248585cb757c232b7a68389f8b8da1c76f9df86a

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