Malicious PDF — malware analysis report

Static analysis result for SHA-256 049d2f788754ceb0…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 17:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 816135eb28c86e076240435f6bde5503 SHA-1: 118be50dbcb16bd1110477eebee1eea6a4d324b1 SHA-256: 049d2f788754ceb0db63b993ca679e7b1b980acf21a099a72849093549d0542a
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary attack pattern appears to be directing users to a collection of external links, likely to manipulate search engine results or distribute additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.serenissimaservizi.com/files/61666789167.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/kiliraximutafori.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161344ea79392c---xoxesovuxajatese.pdfIn PDF document text
    • https://autoskola-scp.com/files/25244281332.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zexajipemizoziwuji.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mipakiredeki.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zezolevufanumamejikom.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/xigiviwazedaxazituromixaw.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/repinasatajisifupawovud.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/61547311525.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911011752_gb4cy0.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/69636504920.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/pabobopetoxejafiki.pdfIn PDF document text
    • http://teplospectr.ru/images/files/9191275875.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/69453006339.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/e012mcts9sp9071ug0dg5jg7sj/54321263232.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/25186546974.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/68198282929.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tajinevasedexikuzusi.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/21035465774.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/zawef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dnd+character+creator+freePDF 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_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 10268 bytes
SHA-256: d6c4fb97135726ab2a33396813d49e466301200770a4289cd03576786f398052
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 19580 bytes
SHA-256: 39047ace065b53136e6c293f0492d39c2ebda0744d9ab327eee40c278148d95c

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