Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4c96a4023b5ea0…

MALICIOUS

PDF

84.1 KB Created: 2021-03-01 00:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 838ab0a42a19de10c6fd03a7258750f8 SHA-1: ad3ee1a0b0ee03b35981794719fd6c81560a43f0 SHA-256: 0b4c96a4023b5ea09b2db383b003b06774dc69c1c962d93326c126d6fc6c136f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://zajinet.ru/123?utm_term=what+is+the+best+oil+to+deep+fry+fish PDF link annotation
    • http://garanibukumom.scienceontheweb.net/12584845155.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/jIiiqhh/zitomajomezejiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/iahcphj/underhand_pulldown_vs_overhand.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/apc_be550g_ups.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384825/normal_60289d8c90a90.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/iioFhbt/6921024657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffb674e877dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5feea7e677e04.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/pght3ao/feruremimiwesadunarinoki.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/Zkjfhbl/pottery_3d_design.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/bcidBgd/komakufakebasefejesizud.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/dgdb8ge/sniper_jungle_commando_counter_attacks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471941/normal_5fdc5433560a2.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/52100795158.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/fghidic/modern_wood_chair_legs.pdfIn PDF document text
    • https://cdn.sqhk.co/denobafopum/ajhjqH5/jedubabini.pdfIn PDF document text
    • https://cdn.sqhk.co/tabakotodi/eC0Shhn/jusetaruninusepen.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/22791480036.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/hfr8hho/mortal_kombat_mileena_cosplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/samsung_s4_mini_display_defekt_daten_retten.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_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 5384 bytes
SHA-256: 9283819e3af345cc8fbcd3d682e97221fa5f1989e1959610559417b27230958c
font_01_sfnt_off00011da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA2 11188 bytes
SHA-256: 9b623c16024a53bd21d121d35428614caf94b5f0c2e71bb472ec2db5f2f45e49

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