Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17d9839355e3779…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 13:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67ede967eefe3760b9392b3db6e90118 SHA-1: 9758f5247a9f19eb64f908548747af911774c2a5 SHA-256: a17d9839355e3779715ef2b5f3e9e98be59cf4b1ffcf27dec912a2ce8e906a19
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, likely to distribute unwanted software or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nocleginaplus.pl/uploads/userfiles/files/12565312740.pdf In PDF document text
    • http://pravkniga.ru/files/userfiles/files/sitaromekilu.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/58977942297.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/kulujetov.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/kujodenujitaxubi.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/vodixuxe.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/bufixogaranefonubujozezen.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/30238997623.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/93412097897.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/tozukabobawawirezat.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161382b0931cd8---samojiwonafadanif.pdfIn PDF document text
    • https://heureka-cz.eu/files/56428095213.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dategeku.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/72692879490.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/patamalakirigadopabizux.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/37275000115.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mavasolomodo.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/nopizo.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/xujan.pdfIn PDF document text
    • http://www.depomatrial.com/file/2990391356.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nademekuxovugepeziwaras.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kifaruvew.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jivokabo.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/20396672639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=whatsapp+plus+jimods+apk+v8+51+downloadPDF 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_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 11288 bytes
SHA-256: 766d465233a3b5b944df24713f5beaff7540c2bd1ac8bd9d16042fd2fe0149ac
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 19120 bytes
SHA-256: b93f6c288ad1f7b5dbef5c12e5a8f0f787204b84c4f2557145ee44ffa528990d
font_02_sfnt_off000124de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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