Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9e903bcfc44550…

MALICIOUS

PDF

103.2 KB Created: 2021-09-24 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53ed91771024d7018673f88b5cdefec2 SHA-1: b2d65906e4c8cb541d6e2c0210e172e6ef6b1b7e SHA-256: ee9e903bcfc44550dc97a9bc79a0af37da78c6befc1bed7a7d774388d99ba67d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The presence of a disposable link farm heuristic further supports this, indicating the PDF's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gajagotour.com/UserFiles/file/jugunosojudilakiligepi.pdf In PDF document text
    • http://progettogeometra.it/userfiles/files/jepovetusafudojuro.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/23602229747.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/40094137486.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/bujakuvipetosa.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210905143028098.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/roxol.pdfIn PDF document text
    • http://freeorden.com/media/file/jekenudanipi.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/velobimupubixus.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/7048998218.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/vagujarotuvagegud.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/segamofegowedudakadave.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/rovuvoxosukobaja.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/fenuvavavalav.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/77102675816.pdfIn PDF document text
    • https://cmoretv.com/userfiles/radapajunesonewowuzowipug.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/10409129983.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/dapuvetogemanemilasukus.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/36430178719.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/tafuwowobusupidakivegat.pdfIn PDF document text
    • http://netart.hu/userfiles/file/lapofuve.pdfIn PDF document text
    • http://one9five.com/userfiles/files/noduketesurejaze.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/mobanidew.pdfIn PDF document text
    • http://hongdacable.com/d/files/15291926672.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130058a8176c---xixonok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+play+ps1+games+on+retroarch+androidPDF 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_off00012b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 11204 bytes
SHA-256: 6f92c8e52bc565a363b32f17a9654f2e261c495e51f77227ee4c8bbb868c202e
font_01_sfnt_off00014575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14575 18688 bytes
SHA-256: c25a2a7a5b4dababc8a0a68b5bb855eee6f21eee7bfcff04ef1b90c7165281fd
font_02_sfnt_off00017626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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