Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c5a0dc766c2a63…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 18:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0115f207eef29dfd1687a956af11dbee SHA-1: c3bf4d2e2631ec5e97ef84a7211d73e0d2146d7c SHA-256: 24c5a0dc766c2a63749e5339cb31f1b81a277d8ef1abc057190f6af5c0c3362e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified as a link farm hosted on disposable domains. This technique is commonly used to distribute phishing content or redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://midufefew.ru/strik?utm_term=cool+math+games+-+%2528complete+game+list%2529+free+online+math+games+cool+puzzles+and+more PDF link annotation
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/zetulaj.pdfIn PDF document text
    • https://cdn.sqhk.co/suwezuzifu/zYhciie/jomenus.pdfIn PDF document text
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/9763550.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/3674719.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/zalexas-wubixokuwekiw-nisokaberom.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/daaijid/warhammer_quest_shadows_over_hammerhal_solo.pdfIn PDF document text
    • https://xojemejavema.weebly.com/uploads/1/3/3/9/133987363/6617090.pdfIn PDF document text
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/furosepakonuvex.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/fovilepemavo_mugajawirudip.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/Xgiha1W/weekend_update_saturday_night_live_hosts.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/hcifgiJ/shooters_world_the_villages_opening.pdfIn PDF document text
    • https://notomufibaka.weebly.com/uploads/1/3/2/7/132740278/nobosipo_nilixom_ripoji.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/fesegimuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejeganemumejow.rf.gd/limojaxobajozagi.pdfIn PDF document text
    • http://tavejetenugaku.epizy.com/columbian_gold_tegu_care_sheet.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_ef2242a692864cd5b4592412e6771888.pdf?index=trueIn PDF document text
    • http://nagivozuzosawax.rf.gd/cadera_huesos_que_la_forman.pdfIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_5b207cf9e3624f1e8cc895678da53c80.pdf?index=trueIn PDF document text
    • http://vofegut.epizy.com/zinusibotevidolarafano.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_06e44ca8a7ed4785864d192b6d3346d4.pdf?index=trueIn PDF document text
    • http://bekelogamaju.rf.gd/77350276378.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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5712 bytes
SHA-256: 0819522cbe4e89da840474979328d2b462aa05bacb76d13c248216074a683476
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 11036 bytes
SHA-256: 8bd7fb8a184c0b8d7110a22a183e3492bd45aa8f49cba0bff7dfdfcabbb81b8f