Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3764e1c58e29d04…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 23:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1dbfa291c06e2d5b60643fddc9cf15c3 SHA-1: db74163543e3a6dcb72c6168cd18c476e78e7dde SHA-256: a3764e1c58e29d04bf8bb4dd889ef8546c348bf6195852c3602ff0174d96dc63
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. This suggests the PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68109041279.pdf In PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wugupiv.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210909_A378239005E11EBC.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/30574353653.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/22929657438.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/musoduzerowezivuko.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/kunemuvubumevox.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/sudanelewiza.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/08bd21860d755f10d32d47fdfc42440b/89281696758.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/11930590455.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/garozepijajekodasagur.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/11683012544.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/41230061891.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/46689267033.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/temezifelakirarok.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/dogamobamefedakafumopix.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/50768601811.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gomewugelutufomeledi.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/37089122989.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/ruzaditebolebuvabofoparu.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090209204744.pdfIn PDF document text
    • http://sql110.com/pic/83616894171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=install+kodi+on+firestick+18.9PDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/lujunajevus.pdfIn PDF document text
    • 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_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 11008 bytes
SHA-256: 579210fb683285a5fc128d3a186c11f6bf93d025bc33ac98038c36db3bbcc6d6
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 17924 bytes
SHA-256: bda3e1a5eed47eba19458017abd01b4fd3ac0b0f177652fc7db5d94b004d3412