Malicious PDF — malware analysis report

Static analysis result for SHA-256 909357679322ce6c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 22:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: dbe6f8773f887c9e0ed3fd321f4e816a SHA-1: 4da324ce58416e23770691c1ba65186b47406164 SHA-256: 909357679322ce6c7ccbc5d9ea55260c69ef82273621b5f97811a1d175e1db05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://infrive.ru/uplcv?utm_term=best+robocall+blocker+android PDF link annotation
    • http://888chji.com/userfiles/files/duzogilujagefazunuxikiwa.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/36327553664.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901165751_1334144759.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/49098600637.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22674455731.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/fetelamitarakegijolo.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/61191526488.pdfIn PDF document text
    • https://digireg.at/upload/51745360011.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/puxifudowe.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/96446578829.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899b1766c---miwufejuxezikogu.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/45208877662.pdfIn PDF document text
    • http://atya.eu/files/file/simojo.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/jiwusigeminesepatuz.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pavugabuwanadojonam.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xefufatedibekotijosa.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/vaboxew.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109040158217532.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/tumugafomike.pdfIn PDF document text
    • http://nature-revive.org/files/file/73579636738.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/59189902438.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7vufc46iqgjcop3ftcdam534u6/rezevesamedos.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/59858694996.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/burogesuvobe.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10648 bytes
SHA-256: a588c244564e5d8226b4d1f3378c7c6446907919ecbf84b8b6a0bc69aab097ee
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 18160 bytes
SHA-256: 361f6df13e061e9de7c24c491783d93d14fde4121974d66e43138fc6a3507668