Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f74225fafc0633…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 13:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc6e97f95a3a38144ac24a93faf47c30 SHA-1: 1e24cadd60628d15b8142aaefd3a842b380cbd0b SHA-256: 85f74225fafc06330e7c8180ca7f38932a26562af72161d1a8bd137ccdd161b2
66 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, and the presence of numerous links to potentially untrusted domains suggests a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • 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 https://clubesolbra.com/uploads/files/89100117288.pdf In PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30788a6d9---31238305825.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/wikudidife.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/puwatajupotixekelevi.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/72155487361.pdfIn PDF document text
    • http://canoeing.by/pics/files/tagutuzaxir.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zibupijavipawoxunebigasu.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/40542678622.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/12489519910.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/zukupetijinavefutudebiwi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363748d8d28---27092557122.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210918184136.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/89336169625.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/gufasunuvifogifopuxewakaj.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/susage.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/romevomuvumurig.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091222161470554.pdfIn PDF document text
    • https://trexanh.net/upload/files/taxolojika.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210918_E32AADB2ED2B532F.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/53333233908.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/bugufewibimegikupukup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+v5+apk+download+pcPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 21968 bytes
SHA-256: 108ba430d19a88b6a937e4434941979e7570892d7f30869ca3970164963dcdd9
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 10432 bytes
SHA-256: 54b8c73d888f87be824bc897ebe53ab7ed0d9346c6b60b261cbba22c59a10be0
font_02_sfnt_off000124a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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