Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a97d71830dd8e7…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 19:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58213048af714c22d3898b89c3243c70 SHA-1: 77d9eb0b6c84488fc3059f6622cb498ac3e2ebe6 SHA-256: 78a97d71830dd8e7786541f8fd132a8cc75f5351c5cfbd8a01cc640ea017fc43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.psychophonie-tarbes.com/ckfinder/userfiles/files/297492738.pdf In PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/wafenaromezof.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ff37427c---24099671984.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/57231506797.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/39587168129.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/18803433237.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910115332.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/26652665908.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/48006546269.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/kaxusikewemakerifu.pdfIn PDF document text
    • https://buka.ru/sadm_files/8255641161.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cf39866d2adc1776d890f10d05124960/jugatonef.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/satadisuviperaga.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/46448234441.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/38529018514.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210909111245_9v6sb3.pdfIn PDF document text
    • http://iviltra.lt/images/files/jozuwi.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/64958131030.pdfIn PDF document text
    • http://jcpingie.be/public/files/19616788624.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/67755026079.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134406a71ba9---xevukozoposopibeg.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/tudofa.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gakiminopedadebegot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pixelmon+download+for+android+apkPDF 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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 19572 bytes
SHA-256: 5e4c96c8cb276c3959f36ecb401bde2b4ba0eb59848970fc21eafc1b39967cf0
font_01_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 10672 bytes
SHA-256: 3f0297d164de24acb32f224ea5c1d93cc6d8b9c462eba3f5a44fc7e1fdf406e2
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1