Malicious PDF — malware analysis report

Static analysis result for SHA-256 8546f76ade4686ab…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 18:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cee23f1379563fae02b43482df4a6941 SHA-1: 7fe401a6e5473d4043a2aae6e24cc08cc4ffa5ec SHA-256: 8546f76ade4686aba71fad3fe9f9efc9e2b5963a7d722e754d87a85a6029e69f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this document is designed to host a large number of links on low-reputation domains, a common tactic for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=demon+slayer+movie+english+dub+online PDF link annotation
    • http://medrea.ru/upload/files/fojabobinuwin.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/64452099470.pdfIn PDF document text
    • http://emannsltd.com/userfiles/70488432106.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/54117162973.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/951e1c2c6a183cd8483ec7d020884040/difopododabiderasubuzu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/tuxarofemogeledorenevaxod.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109072002264327.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/malosa.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/livizibozeranetesopemo.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/75863277763.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/waruxabelixitoxota.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136628ac1c5d---libupuwixuvoxubokutiz.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/38930963703.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/74771299233.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/gimojukobodatetanurusadi.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/sinisigajoxo.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/76548187344.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jufaweronenov.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/38067547349.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/2772507389.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/67912575564.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/98162429806.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xatukunazaxoj.pdfIn PDF document text
    • 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_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 11016 bytes
SHA-256: 886415eb32684d7a7b7e4fc68eb46094ff2b73978c4915b515d431d2f74de352
font_02_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 18192 bytes
SHA-256: fe1f14c178b2d1800c6e3aa1e7b5913226801a6bf87bec96f9d6c8dd0ea4746d

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