Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee7ef82c03a2770…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 19:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9742e6b2a50fc18774df4d1de326956c SHA-1: 92c004e8344961ece05db163b7bdc855d15c9bd2 SHA-256: 7ee7ef82c03a2770c4d3466ac11aa8eeed2784a642f31d35391aceb77e05b5bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs that lead to suspicious domains, disguised with a seemingly innocuous topic about cleaning a gas heater. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the presence of multiple external URIs and the link farm heuristic suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=how+to+clean+my+gas+heater PDF link annotation
    • http://muxufeguzugebu.iblogger.org/dagage.pdfIn PDF document text
    • http://narosisebono.22web.org/cherry_bomb_performance_ver._nct_127_lyrics.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • http://fonareru.22web.org/reacciones_de_neutralizacion_ejemplos_en_la_vida_cotidiana.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/milubujokamenujabaxanisef.pdfIn PDF document text
    • http://gisejol.iblogger.org/karelerarafok.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/55417095544.pdfIn PDF document text
    • http://limevol.iblogger.org/telifasotimogivupubavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/108dd0f3-070b-4354-b72c-1eca6dccbea1/goketugosekuzepuva.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/vapajuwaxikigumatejupako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2b7a12-b744-4a9f-ae36-42a06527b63f/09g_gearbox_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8003ea0e-10fe-4889-ab62-ea5e9a29f9ab/nuevo_cdigo_civil_puerto_rico_herencia.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/54029625364.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/kapoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/does_the_number_644_mean_anything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ca92fb-c08c-42d3-9f90-b1c78fdc2221/babozalapifovojipukum.pdfIn PDF document text
    • http://rugokabiko.epizy.com/24334568668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c7894b-0777-471d-b16c-5ccac31c213e/programming_baofeng_uv-5r_with_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/bimegorozesorexadefu.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/73078957179.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/20176187149.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_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 5368 bytes
SHA-256: c62595d3fcb281cf52c63f2ab44eb0a777270a61d54e0d2bc999e8be3fe3c0b5
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 10436 bytes
SHA-256: 1bb76384e322b8232e11f240c4b9c645a9cf1909dd5ff0fb12b3321ff67e2158

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