Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b246a75f87cf5cf…

MALICIOUS

PDF

91.3 KB Created: 2021-09-11 02:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 996974c6ab3d7a19322e73982e878dc4 SHA-1: f4c822e0c03f89f622b22ea26adb892e535dd55b SHA-256: 3b246a75f87cf5cf0d98356be3eaebfc91de77dbe2b89561c314064fa44d1cba
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 0.9974

Heuristics 5

  • 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.
  • 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://htijsr.com/userfiles/file/66676252027.pdf In PDF document text
    • http://swvocal.com/data/se2/file/89008361448.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/xirin.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/12966862597.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/58347629376.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/mupefa.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/54447206190.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/rutek.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/44187850840.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/55547747932.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1ae5cd4c843d87bfe9c986885383e92e/pijab.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/18730731627.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/5220071004.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/fezeduvokos.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/boretapabezinibosot.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/66190037269.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/dufogosusoboxetuzapuwabo.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tesasararuj.pdfIn PDF document text
    • https://egf.tw/test2/images/file/46333555813.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/45507939911.pdfIn PDF document text
    • http://tayles.com/uploaded/zapabowa.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/kakeweboxazerov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/q3uf1pmg6bpfmpvf5nna9vi2a3/kojudepirupuzapoxokeval.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+oyunlar%C4%B1+bilgisayarda+nas%C4%B1l+oynan%C4%B1rPDF 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_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 19132 bytes
SHA-256: 55f87c8690738a5414649ac0f3bb7d005f7b058dba7935a5c47c4f8f653df203
font_01_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 10576 bytes
SHA-256: c1a93217f242d7e9b617e19121f213014d896d74dc72b15a8b9538cf09c6f03c
font_02_sfnt_off000144d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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