Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a545af799d9773d…

MALICIOUS

PDF

73.6 KB Created: 2021-03-29 09:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ba15b5efc93a041ce521fa973d1e72d6 SHA-1: ac51b534469bb267520940a5d54b619fca1ae665 SHA-256: 6a545af799d9773d783d5d5c45d77f773e07df20a22e1a093b76718bcce0fe1f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://vilenefex.ru/strik?utm_term=typical+cross+section+of+road+as+per+irc PDF link annotation
    • https://jaxipalat.weebly.com/uploads/1/3/4/7/134746428/keguwotepofoza.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Mjdicii/rutikivesuzubasim.pdfIn PDF document text
    • https://cdn.sqhk.co/ronelejibir/4IageT1/29023441926.pdfIn PDF document text
    • https://cdn.sqhk.co/vasavubedo/e2Cge8a/exploration_minecraft_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/dmciagd/siberian_husky_puppies_for_adoption.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/hedhgDr/big_rig_chrome_shop_coupon.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/7sGejjp/conveyance_voucher_format_excel.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/hotsy_pressure_washer_parts_breakdown.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/bapeleve.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/dojujurutizuravidilut.pdfIn PDF document text
    • https://bugibupezo.weebly.com/uploads/1/3/4/7/134711935/4469409.pdfIn PDF document text
    • http://kejumazinanu.mywebcommunity.org/wimilulibagowonekinudu.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/kijO9gc/how_to_make_notes_on_iphone_xr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/manual_campana_extractora_challenger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d272bf-61b0-4b49-8614-b9a7a67c80d2/witejuwuxugujerarepa.pdfIn PDF document text
    • http://womidelere.myartsonline.com/20747025113.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/livolibuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4460d8db-c596-41df-ab7c-c8c2e29e297b/what_is_the_purpose_of_avro.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/lg_wm2101hw_no_power.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/programacion_neurolinguistica_tecnicas_avanzadas.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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 5200 bytes
SHA-256: fbe0b4651d121803c571b68d00008469b3d0c9901473b0ece0fd637e2481b2a8
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10492 bytes
SHA-256: e1f006b148a2356310d6eabd0204ebd6160b8a5905815cf63d1bbe3672aba1db

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