Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28025efd129161e…

MALICIOUS

PDF

87.5 KB Created: 2021-04-30 20:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b8a5358691f50f7ea900c4a1f6d0906 SHA-1: 04f375eb5e44f8e7a8d4b5f54fd7e85b7a507b7c SHA-256: b28025efd129161e89dd89b872443bd4b70f3dedf543d9e6e0b60314c7af3982
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://soxebez.ru/strik?utm_term=de10+lite+sdram
    • http://padujosa.22web.org/converting_between_units_of_measure_worksheets.pdf
    • http://mawidoxejonej.iblogger.org/tunorefir.pdf
    • https://static.s123-cdn-static.com/uploads/4476930/normal_6001e393dcef9.pdf
    • http://menbp.online/one_piece_capitulo_18_espaol_latinojv4t3.pdf
    • http://top-agent.ru/pci_serial_port_driver_dell_optiplex_755_windows_7_32bitzrqiy.pdf
    • http://waxawazurutane.22web.org/nubufejuki.pdf
    • https://cdn-cms.f-static.net/uploads/4501998/normal_5fd854b7d5b68.pdf
    • http://risatixedigati.22web.org/39044413207.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://conicppjry.bid/dewalt_pressure_washer_manual_dxpw3425wrlds.pdf
    • https://cdn-cms.f-static.net/uploads/4458122/normal_60320e2c59fca.pdf
    • https://static.s123-cdn-static.com/uploads/4457862/normal_5ff0a3025506d.pdf
    • http://wepovak.iblogger.org/63016993963.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ragupufonipona.epizy.com/tazemivezosetizifilad.pdf
    • https://s3.amazonaws.com/datarofapakil/physical_and_chemical_properties_of_sodium_bicarbonate.pdf
    • http://fizufizobizud.epizy.com/western_digital_my_passport_wireless_pro_2tb_manual.pdf
    • http://rezutoxuk.rf.gd/common_nursing_interview_questions_icu.pdf
    • https://s3.amazonaws.com/rakabexozu/gufotuladigudixulabidovo.pdf
    • http://fufibilola.epizy.com/critical_appraisal_worksheet_systematic_review_meta-_analysis.pdf
    • http://wejanofe.rf.gd/vinajasetuvadovewudujo.pdf
    • https://s3.amazonaws.com/vukumesoj/41872304327.pdf
    • https://s3.amazonaws.com/kizugokofo/bibugud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001002f.bin
300a814e2d47a2ea010a7e8491ba81b8575634afb6b55a9aee1560084d9ebc3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1002F 5164 bytes
font_01_sfnt_off000111b1.bin
c11504a2dbc0802c8248caf3242502feea301b746c7ceed2e0cc2d34da8fc6de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 12868 bytes
font_02_sfnt_off00013bd5.bin
81c7956dde52e5d908b0cea9d7ac892b31ef59a5fa024a2c105376ba8a0fbb11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 16060 bytes

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