Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6118341d7b007b3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5df9aca41f1a395be40db61a5c75ff46 SHA-1: 30963a861ff784b20c8629baba7cfbfb481d8c43 SHA-256: c6118341d7b007b3606830a9a8b64ef3db8fc5be63aadf64f604e07f7a2903c5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts and disposable domains. The embedded URLs, such as http://olynskiconstruction.com/pics/file/77013088644.pdf, likely serve as lures to direct users to malicious content. The document's structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://olynskiconstruction.com/pics/file/77013088644.pdf In PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/lukavo.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/luxilamadusi.pdfIn PDF document text
    • http://ccadl.com/files/20210915192406.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137435bacb8e---20915875478.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/78310052510.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/37284986086.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/25429868833.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/kutewixu.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/zagakinibivofulifanile.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/pibejajexoroja.pdfIn PDF document text
    • http://selidbe-beograd.info/files/jipusejojunusegavoku.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/gunotipetuteroxavipefu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd90459dc---bajaj.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/80519291613.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/vezikivolelu.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/bufulevoxu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/67427374833.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/19452646753.pdfIn PDF document text
    • http://headrepublic.pl/images/files/37749796857.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/64899594164.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/xekaxutalenevibewik.pdfIn PDF document text
    • https://cmf8.ir/data/file/67596396930.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/91111566038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=online+game+flip+the+bottlePDF 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_off0000c14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14B 10704 bytes
SHA-256: 50376fede21a94bb7b3750b2fd4bddf8c7775eff10339585eb4b29ccaa9c8d49
font_01_sfnt_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 16336 bytes
SHA-256: e96372ccfed74717fe838c9a3299b9c8a5a714852dfc8f15a7e48fc53219e471
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1