Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b3f93142f76d59…

MALICIOUS

PDF

74.5 KB Created: 2021-10-04 17:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3b794863108f93c2c03d21168075a585 SHA-1: 4ca429e0d63f9a524d7bc10a0e210093d3b6d7e5 SHA-256: f3b3f93142f76d59f7a3359d1f906c8c72306007265c718fadb468542dcd2d4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple disposable hosts, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://idealist.ro/userfiles/file/90158734662.pdf In PDF document text
    • http://transfertrolley.cn/d/files/ladilubekotiturewetaz.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210921_FB95F947B2E5C8E5.pdfIn PDF document text
    • https://gilbertems.com/videos/file/8276473234.pdfIn PDF document text
    • https://camphacement.vn/upload/files/lokaku.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/mokabovuzujisexafijudadib.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021916144399180.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161593ed959cbe---jusagim.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/83970281600.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/sidufidusujuz.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/dekopeloxuvegavedadi.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/95191154587.pdfIn PDF document text
    • https://linardi.ru/files/file/34736733981.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/lodededoloram.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/72015865289.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/nezoboduzozaxovozogeb.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///83963201861.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150d8e5a84e8---76473294423.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/folovubafi.pdfIn PDF document text
    • http://jljemc.com/upload/files/8743565170.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/paparenonaludizefija.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/basavulak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+work+upPDF link annotation
    • 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 17316 bytes
SHA-256: 13aa75396e2e794dfb61c98e67fadc8d7d17d61a235863006f0ca51c658a3512
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 9920 bytes
SHA-256: 8397f2801ac8ce92063875dbbb25311539a255f2ed95acc75a24ca1badaa5233

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