Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbb19901a4d7a65…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 16:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 040ff9065956d13a88fc693b4b335bd6 SHA-1: d8b31d5fc4f40cfa8a2318ee72ae77aa15b2fff1 SHA-256: 2fbb19901a4d7a65bdcc370ed09abf0d3cffcee0d3a09c899f8a05393895ca5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://didula.ru/img/file/debogawigizasarunirobiden.pdf In PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/94158786270.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/27607195141.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/jevazu.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fubosuletubugudase.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/77591914071.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/878209912613930618e945.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/fabagadafiz.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/59019400949.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/bexepixemokaresej.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161370c1b5a745---kimudom.pdfIn PDF document text
    • http://pnalog.ru/images/file/segitibateno.pdfIn PDF document text
    • http://rld-carbon.ru/file/nifitudalinevibowafidaz.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/popasa.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/xigimegexax.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/81980466774.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/1837575658.pdfIn PDF document text
    • https://titishop.co/upload/files/5914747729.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/18312071478.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/kopezolixotipezez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=brain+test+apkPDF 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_off0000b406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB406 10224 bytes
SHA-256: a59be721b297128fc3b47749b9072fb4b957a18e0612457e47e964132b16e1d2
font_01_sfnt_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16708 bytes
SHA-256: 3ff2071683dcfde218600df3ff045267d91f719519d49d5b4a6ba290ec462ba5

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