Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30b2692e4b8645f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 09:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa34c71ffd2af51062218fc2c37fa144 SHA-1: 7812ed3f5032c0047dda15ec8f46874bc86cbde4 SHA-256: a30b2692e4b8645f3e80f436c091327f2a544a44d38559b9616a9ac74106264e
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous links to various domains, with a high concentration of disposable hosts. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137599c3ee6c---60507803727.pdf In PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/91266971058.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/gemeb.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/91386473815.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/59749444973.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/nitukog.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/26352857768.pdfIn PDF document text
    • http://rideco.hu/upload/file/22741941941.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/koxuguvuvalirovep.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/13051751742.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/mabevera.pdfIn PDF document text
    • https://artbynela.com/uploads/file/doxili.pdfIn PDF document text
    • http://only-svet.ru/upload/files/zimogajetuwodatujukubud.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/nesadimovamofazalij.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210921015524.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/47401117597.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/wowikujitajogisikob.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/fuxovamiva.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109012200412016.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613664460fcf3---saxunusarek.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/latukagajopekotomajavofeb.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/bovekiwowoxosutajebera.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/49695580717.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/33439351039.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/98534569454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=online+and+offline+marketing+strategies+pdfPDF 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 10960 bytes
SHA-256: 2fb7a4deec4e9041e44a7164e533ae464a6123ab22617909045cea696c84107f
font_02_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 17956 bytes
SHA-256: dcb6b3c33fc1d45248eb474ba75b96cc0533eec2901ccbd3b092cdf02ba46aad