Malicious PDF — malware analysis report

Static analysis result for SHA-256 3496fa8fa6194c64…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 19:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a2c78fbc05d85af452e01e753576b4f SHA-1: 6916818dda30381eb566dd52f3803731f287fccf SHA-256: 3496fa8fa6194c64740fc93d457d72db1b4eec86e7bb3de2a520e651649333a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host numerous links to external PDFs, likely as a lure for users to download further malicious content. While no scripts were extracted, the presence of multiple unknown URLs points to a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://bulmarconsult.com/files/woworewilozudejub.pdf In PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/27578042136.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/52014866761.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/korowukikexuwiwururod.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210906045735.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/62949001825.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1dbd43d42---vamawugififati.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/19970423720.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vasokufumaz.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/vuwekevigiribikuxev.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/65001580932.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/6812096030.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/29375247604.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/suvopujerevalow.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/14330959701.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/27004005625.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/2177935534.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/kewigutuxogoj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3152863fa---99014230044.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/11484920428.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/73186472177.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/96322334620.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/62857896792.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/soxadanovusufasuvazo.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/pomuxinokikubuki.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/jugilozupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=battle+of+ship+mod+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_off0000c54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54B 19836 bytes
SHA-256: 07b8277db0bd5a536e9f5622b69bb2cc404265a8e6d0c90a99061a663462ac0c
font_01_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10704 bytes
SHA-256: 39c6768de31c6af989c8b6b38af8953b27d2a13875964c7b24ad5e176316bf7e
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1