Malicious PDF — malware analysis report

Static analysis result for SHA-256 9117acf12e612292…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 19:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 435e3abdf29fc72bb572498596d3cc2f SHA-1: fdd45d5d632dde329bfb5cd66bd317a4e635a51b SHA-256: 9117acf12e612292ce784c82fd126c47f0eeec31b265e871089e2191dc2a83ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this by identifying the PDF as a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=dual+boot+windows+10+with+kali+linux PDF link annotation
    • https://gogreenonline.net/userfiles/image/fckeditor/file/fejakopufirijudovazi.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/62812888132.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/43627728117.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/90895337793.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/metokefotos.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/41434465039.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/buwomosonugidupenakegi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/16254186316144482f396e1.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/7591092628.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kedajatagubijo.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/92685133153.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/10886108093.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/87830568444.pdfIn PDF document text
    • http://ty-int.com/files/files/lebififuwup.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/ximegilo.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/96455958237.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/beledixaleramipuxenimim.pdfIn PDF document text
    • http://hodori247.com/uploads/files/4376912485.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/84127594723.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/7952202786.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/29675231200.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/54282173822.pdfIn PDF document text
    • https://senegal4d.com/contents/files/simeb.pdfIn PDF document text
    • http://centromp.it/userfiles/files/gubub.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 17248 bytes
SHA-256: 68c0402f72bedf7c60c472ae937758daac1617c7fcf59c248de8b08d6c4a8d6a
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 10808 bytes
SHA-256: e76c95a784f20239009a2ce27da7d6ac039ff71c226120a96cf983e4878f0981

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