Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d1c49f99726f8a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 13:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c629aeb15d215a1de21069ce777974fd SHA-1: 0d9d6f07980fd84a14d506ca63b49ac7e2b15372 SHA-256: 10d1c49f99726f8a5ff590f71c075a21c493d6818230288cfa4fbcfef0a3a359
142 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 a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://xn--aknmedical-yub.com/uploads/file/babemopazinupejujefixep.pdf In PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gavilazitef.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/15147360524.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/74580200789.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/jugenufapi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/57335291828.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/40673192909.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8b37838d7b78446174780d0327e98de8/sunupawazabarabija.pdfIn PDF document text
    • http://scpt.it/userfiles/files/livexobexabam.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353a05e08a0---48545533467.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/5935325004.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21809600954.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/89766156133.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/49121917421.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/bazemazekuwiwe.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/1691091395.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210910070352_bzmnrz.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/jarifotigep.pdfIn PDF document text
    • http://popmetre.com/news/files/15218916776.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/tezapetetawog.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/xafubifo.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/960546300.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/6327156068.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/81025616148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=simple+comprehension+passages+with+questions+and+answers+pdfPDF 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_off0000cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD10 17664 bytes
SHA-256: 0e6789de2d467381df0e44a126ac6b74e1bb5f2a6bc4f731a4a08be318c51b63
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 11476 bytes
SHA-256: 7ddec613ea5b60602e7040fb53496376caa4e9f05d1a692c59d2b6ced07df7bc