Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfc23a4a21d7836…

MALICIOUS

PDF

77.3 KB Created: 2021-04-05 05:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b1cd614045ad08635283e7a781f2f36e SHA-1: e01752d08b9cb1869d78ab006575c37645b7c314 SHA-256: 9cfc23a4a21d783620722efd53f743ff623fe18860c006582585772f4fc69914
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a high ML score. The document body, though heavily obfuscated, suggests a lure related to 'hotel accounting system free'. The presence of external URIs and the ClamAV detection strongly suggest this PDF is designed to lead users to malicious content or exploit vulnerabilities.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xezojetit.ru/123?utm_term=hotel+accounting+system+free PDF link annotation
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/baribibugobilewuj.pdfIn PDF document text
    • https://bokitixeloto.weebly.com/uploads/1/3/5/3/135344606/papafawewuzoz.pdfIn PDF document text
    • http://nanolenka.xyz/ropar0ibgw.pdfIn PDF document text
    • https://kamidosebesu.weebly.com/uploads/1/3/4/5/134593467/foxodafufezeget-surifo-nuwagulax.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/guitar_family_chords_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_6001dd4739249.pdfIn PDF document text
    • http://upgrade4me.com/diluvigigobibile4teiz.pdfIn PDF document text
    • http://vizit.store/density_problems_worksheet_1_answer_keycutr7.pdfIn PDF document text
    • http://veronaital.space/best_android_tv_appsx1tv7.pdfIn PDF document text
    • http://fajiwegoj.getenjoyment.net/99951369088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5fe10d55aa326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370985/normal_6007c801852f8.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/powotagubuwunepuziwusamamz05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_604a42cac5701.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/bopufab-janexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulitisagot.atwebpages.com/sunday_school_attendance_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b00ff0c-58b4-4ab9-9758-16553f3d2152/84844624037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2a6a3c-b829-4568-8505-84201ebaaa69/vinezebodikeg.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/applied_mathematics_2_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/331012ef-9c4b-4eea-93a9-f420854b9bcb/zepuxova.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/xepixotapifek.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_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 5264 bytes
SHA-256: 718edc3eb7fcb47ed9d617878f81abfbebd8a1d333163b68a1fd0a9e67783fa7
font_01_sfnt_off000104eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EB 10496 bytes
SHA-256: 08d99a7810b89b8b964113639a144f00d7c60ca2234202c1a2f672017f16d2a1

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