Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b5029bdcfe397c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 19:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e489ef091bd5dc1224b1711fbd7c7737 SHA-1: ea824c1cabc46c51e3a4c628847aa5dbeaeef286 SHA-256: b2b5029bdcfe397c5774df75d0f7b7545bbc8e9a27126ed49d989c7f2db41e0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards malicious intent.

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 http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tazub.pdf In PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/berunidinona.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/14190936226.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/12541534264.pdfIn PDF document text
    • https://funbugs.ie/files/file/favelinotanexeneduzej.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/69c606d473bde8d2d8a60f3870cce0c2/busudujekopiredejivet.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/39164261718.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kiwivuseneveb.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/nupijanevakisuvo.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/46805769646.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/70779988479.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/vofanukewunatudupewoxane.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/guramuzofuki.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/7504970265.pdfIn PDF document text
    • http://iucecb.com/files/file/gakonipoxurepojatanolume.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/lomorigivoximi.pdfIn PDF document text
    • http://grafitym.kz/files/file/89183418398.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/35236115332.pdfIn PDF document text
    • https://ottopianos.nl/files/482239977.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/15396533269.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/makan.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/53072487549.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rebogiredudazopanotakane.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/ganuji.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d5556d0423a2a2e497cd6f79eddf019b/24745940799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+link+android+to+windows+10PDF 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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 17048 bytes
SHA-256: 2f5d5076c2f9868a663cc9452691b73ff28c32f8f3ece2406a243a5486950f98
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 10452 bytes
SHA-256: ab40c965b7bd17bfe6ad8f0be39c979c199ee2c68262d0dd8fd907f9520146a6
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1