Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65f91045355e1c2…

MALICIOUS

PDF

105.0 KB Created: 2021-06-07 17:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 39f1590bba6e250c55059867496344ee SHA-1: 043beeefb330984da65cf99a57b894f3c5404643 SHA-256: e65f91045355e1c2dd32e1a660537819889cb2d88d55df8eb8dc082a1ebba228
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack aiming to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://laborke.ru/pbw?utm_term=download+kuroko+no+basuke+last+game+sub+indo PDF link annotation
    • https://nesowiziwobuda.weebly.com/uploads/1/3/7/5/137504266/fovedixutefosa.pdfIn PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/xugum.pdfIn PDF document text
    • https://xumusozopojuvuj.weebly.com/uploads/1/3/1/3/131398507/xotiruwikitezopilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_606025a5d0af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465388/normal_60b9547a42f84.pdfIn PDF document text
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/zebilexasulamu-pujalosokokudur-dunewexal-powuwubos.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/2030467.pdfIn PDF document text
    • https://worojuwoxalo.weebly.com/uploads/1/3/0/8/130814432/7c93b3.pdfIn PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/rolife_bemexadolug_ximesuli.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/wanezotu-gujukuva-vavelasarunimer-forafagimobus.pdfIn PDF document text
    • https://puraxatelodo.weebly.com/uploads/1/3/7/5/137518437/vosapitup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_602dea8fc681f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a14321b-afcd-49ad-86fc-684218d6ac68/90104235849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae65e9d-14c0-4f5c-ac22-a6244dbdf174/dobuliguwoxowakalaxoxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe56926-f17a-4988-a036-670716895244/toxilodupazijuxerapus.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144553200/how_to_reset_samsung_galaxy_tab_3_to_factory_settings.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/botadifilifukasitekovago.pdfIn PDF document text
    • http://lukipuj.pbworks.com/f/69304558884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642aed59-a90b-4dc2-8ca7-4be212028a02/vejikifafubepavezejaxitem.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000169dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x169DC 23944 bytes
SHA-256: a70196196b6d04bd1e05ac7cb1cf587dcab15c70be5cadb2914bc1d8755435a5
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5852 bytes
SHA-256: cd2ab7a759568f643ee8b105c6773c63882dd9bab7ccfbd3fa78d39fcace1a4f
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 5440 bytes
SHA-256: 1566f9f3cf8de4ff6426a507ba9b449a00d74f9c39b26a76c718148110d98af7
font_02_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_03_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 11428 bytes
SHA-256: 51d62ee9654be495476690f4e812eb478aad83b0a9c256bfbe8e757c6c3f81fa
font_04_sfnt_off000143eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EB 11360 bytes
SHA-256: 1061ffc66c277c660a31be5f02e0f34a0223fcadfb8c71b2285a4988a22f3988

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