Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6b2fde92aae0d5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 02:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 31abb69ed5d6dfb16ca2c73bb6d57de5 SHA-1: b94e8b8d2ec1d7ec88baa3390c7a1dbef320a855 SHA-256: 5d6b2fde92aae0d5d8add9206d48b148a2ec94c01a412d5a5af7aa5265743e91
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studio70.eu/userfiles/files/dapeluwevomifaji.pdf In PDF document text
    • http://chipgene.com/image/files/20210907_081055.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/26652469873.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/tumirajivodorizoj.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/2192331341.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/33454676505.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/xexavub.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/42517547904.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wevajepetefemipusejixut.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/sebikatoli.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/nudinusop.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/gajakozupopoj.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/kewiwizafuduxa.pdfIn PDF document text
    • https://arerp.kr/data/file///buwefekagozuwuf.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/61358151131.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210919063044.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/30994595899.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/tapewatimijipif.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/71227902783.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/degijoxutulerabuki.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_094546.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/zirisukumufebisisojo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/86049212313.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304cfc4b74d---65970144074.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49653693885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fighterz+android+18PDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 17324 bytes
SHA-256: 732dd47abe61fcf4ca3ecd356cc3708df404bcece12f9807f4bb130610eb929c
font_01_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A8 10612 bytes
SHA-256: ef8856b524d15c380a376b8250dad8fcb99daf02c9716e9adb930d7d0e96553a