Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd8a51ae4c889ca…

MALICIOUS

PDF

82.0 KB Created: 2021-09-23 01:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94dd4d1dfc26f37a32b549c9fa1f9189 SHA-1: a8aae4246bec30c0a4c5226aa6011411b2e113f8 SHA-256: 8dd8a51ae4c889ca5eb050efec48ebddcaf819e1449e3ebf304e423462b9c7b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, further supporting a phishing or malicious redirection scheme.

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.diplomat2014.ru/ckfinder/userfiles/files/bafizonixejerozidujuj.pdf In PDF document text
    • http://www.northern-japan.com/image/upload/File/2346644662.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f98e2b5b---35462090407.pdfIn PDF document text
    • https://southafricapools.com/contents/files/wefipanavazemavujal.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/moxerabagaseb.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/15769963746.pdfIn PDF document text
    • http://355353.ru/userfiles/file/wubimeripeb.pdfIn PDF document text
    • http://midel.me/userfiles/file/razotuxevimew.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/zufatenojo.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/kituloxatuwixeruvu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/47917813188.pdfIn PDF document text
    • http://machin.kr/userData/board/file/vomimukewebonojatup.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/wopasewokibax.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/93189583754.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/wigajubekep.pdfIn PDF document text
    • http://lscapital.it/images/file/napugub.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/sokijefup.pdfIn PDF document text
    • http://hanifeugur.com/image/files/jejubuvekixaxumupovusinox.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/79312295156.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/60751024636.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/ganuj.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/16333962051.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/sagikeselenabikuji.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/93551008845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+alphabet+tracing+worksheets+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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 11192 bytes
SHA-256: b6aaae492bb6e5b89c6ca4d3f9d19effa4c5fe1ffb39b07e263325db5244ae84
font_02_sfnt_off00010e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E84 17064 bytes
SHA-256: a23ae23cc03240f095c70155563658780a72da6397bd692809859fa330cd78eb