Malicious PDF — malware analysis report

Static analysis result for SHA-256 9995a7275e33830e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 07:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0094d61e014b54739d9062af3b3e9caf SHA-1: 670431ee38b67b9cc9496b3ca537e84865cfe89a SHA-256: 9995a7275e33830e714325f0bfef0c4f68ced27346405b772b4a1a29b6305765
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The primary function appears to be redirecting users to a network of sites, likely for malicious purposes such as phishing or malware distribution.

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://tarp.longi.tw/uploadfiles/64728241335.pdf In PDF document text
    • http://fsgzb.com/upfolder/e/files/20210907031013.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/95062390784.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/86411252922.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/lazokilebozo.pdfIn PDF document text
    • http://gzxmbx.com/uploadfile/file/2021091704013873499.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/4974564997.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/xuwej.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71784055288.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2853b3e7---55447131714.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/vogugejo.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/ruwojeziviw.pdfIn PDF document text
    • http://fittbikese.hu/files/file/fewin.pdfIn PDF document text
    • http://bjjiffy.com/upload/44538708616.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/wesaguzazedigedevewu.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/bulivaxitesu.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/78413300201.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/zibinonawolok.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/26238539202.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/widevidalufiriwipararu.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/23202480519.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/19101939561.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/44916510513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=shameless+season+11+episode+1+watch+onlinePDF 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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 10892 bytes
SHA-256: 37e67d57421299b356fd4a5ef6415da1777f3df4170b89a6b85cae7311a1be68
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16852 bytes
SHA-256: 58f21787eb2cdcaba0b82b32139cc91b4892cc7e301cb4c06e0c241ac2e75cf5