Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9365133fb215e8…

MALICIOUS

PDF

127.7 KB Created: 2021-03-24 18:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e231f866c854f724186eb0dd30e3221c SHA-1: 0e2d98fc955a4639963cee11316e5fddb7c68035 SHA-256: cd9365133fb215e8c6bcd975417e444ec474633e419730906518f5ed43de8fe4
206 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The presence of a high ML classifier score and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The document likely serves as a lure to redirect users to potentially malicious websites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/123?utm_term=catechism+thrissur+s PDF link annotation
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/2743759.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/duvesunizuv.pdfIn PDF document text
    • https://zadivodewereb.weebly.com/uploads/1/3/2/6/132683121/takijibiwun-ponavoxus-joxuwaso-refili.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/rizetimute.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/0e20f.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/zinabi.pdfIn PDF document text
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/vigokusabis.pdfIn PDF document text
    • https://ropemobajakim.weebly.com/uploads/1/3/4/6/134694841/7390344.pdfIn PDF document text
    • https://lorumotavur.weebly.com/uploads/1/3/4/6/134693112/rafijegov.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_4e2a1d0b2d71477a8180aba6ccbc240b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/74973890543.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/nudelas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb958679-bfc0-4bae-9be2-cea026288fc5/forabolid.pdfIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_2fbac267af6a4c108350d0ea2004f02e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/711fd361-ccb2-46d2-9555-0d75ec9f5ad6/all_the_things_you_are_chords_guitar.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_93b29c0c49064b99b5309d40ac1e0ac0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8debd1-df83-4eef-aaf6-8ba7757174f9/us_army_reserve_command_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/ubuntu_usb_stick_boot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49859774-b172-4c1d-addc-e6ecf67c31b7/acer_aspire_e15_windows_10_neu_installieren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd54f144-1f8a-4219-8cce-0393607181ec/76168095758.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/st_edmund_campion_school_maidenhead_uniform.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00015974.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15974 31972 bytes
SHA-256: 005370648c6c3f8573a77eacfad4a73c1ba6ef8cd11469874cffcb1e8e4e031a
font_00_sfnt_off000148fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FC 4912 bytes
SHA-256: 3ad036554cf4fe2bf702373aa5fdfe8246ff42020f89a4daa594289bcc494bcd
font_02_sfnt_off0001b1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1A7 11796 bytes
SHA-256: a0f0937bac0cb5c0a4b9180aeb4afb13444f1120d596e9d0deba1889c252a63a
font_03_sfnt_off0001d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9FF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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