Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a7e0ee14bbcaca…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 17:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 887c67192253e6c0d1f45402a1a9e9d2 SHA-1: 750effffff8814fea2984005c1b4ca82dd9d282f SHA-256: 86a7e0ee14bbcacad75f0051a9db18864fe1cc9c4f724311603429a8108417e3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://synerhu.ru/uplcv?utm_term=auto+detect+otp+android+example PDF link annotation
    • http://tiyuchangdi.com/upload_files/files/20210901_200723.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/gemagosusese.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/8536664930.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0ecdbaac3---22720781546.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/gobidupuwutesewezo.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210904_041332.pdfIn PDF document text
    • http://spiregene.com/image/files/20210903_232644.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/fopepowemate.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_224638_764.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/zafixi.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109090819405980.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/52823523183.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rufosurilumugiweluruvel.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/2251205706.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/80258808285.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/87599608074.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/72988739098.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/95074849348.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/365b57c96f1dc80d51057e61d2cf7d31/kufes.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafijuxi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dedalapuwutusa.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/rebojetubetunitidomajexa.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/poseriwuzaxok.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/34605839936.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88595185714.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a65bfa61---79562576101.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/25659817786.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10688 bytes
SHA-256: 7f79460b96c146ce3ed9f13d04b0d7589bed583859f5c154c42b22301d10683e
font_01_sfnt_off0000f505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D17 17804 bytes
SHA-256: e750a2e6f8a73c30a1ac1d66ba89078cbd0e35a0300388c1ec314a518644cc2d