Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a66febccf04008…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0f881bc77268ce570e5d075a4b91e5b9 SHA-1: 4e58195fc6635fc73054ee20aaad534ac7d869b2 SHA-256: 30a66febccf0400850bb2631eb6a639de3571e04db0c9dc55b7bc07448054223
126 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://sbsinternationalschool.org/userfiles/file/zomokabuj.pdf In PDF document text
    • http://proetcontra.hu/userfiles/file/rivuxija.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bulafipujipopipuvediluwuf.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109122246209500.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wedewulefaxatajeket.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f0f6319dc10e3cbdfff33db2f73df73f/koviki.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210907065111.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/22653093310.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/79376816408.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/robizelaraperi.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/warejedirizasusanoxevaw.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/farutapaxowulifotolexi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161330f8ba8103---40519119490.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/negunejilorazu.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/pezovisig.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/60878597539.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/833537672.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/tirubimomekarikilo.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/19561292245.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/77733144393.pdfIn PDF document text
    • http://ruresept.ru/files/file/36256220854.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/dopized.pdfIn PDF document text
    • http://rubensova16.cz/files/file/68263774635.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/76830507617.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/defitek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=my+phone+keeps+turning+on+and+off+by+itselfPDF 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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 11216 bytes
SHA-256: 09f88d43d8bbf36adb7ce1af60ebf1a3711423ae69f38b0d7121070a86e23d21
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 18356 bytes
SHA-256: 02cd1d8eb1edfd9dbe2419c9f6559c5a602c40af76eb37c79ab28a0bd5b26bcb

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