Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0ef9b933718682…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 14:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7bcc8fda78289b0402a233436a9eecff SHA-1: 5d408e6a89370a7b28e71a49fcf104bfd22900e8 SHA-256: fc0ef9b933718682106057d1abe8a4fc0bb4cd920d8e9947148ca56667a50b25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://wastran.ru/uplcv?utm_term=boat+pennsylvania+course+answers PDF link annotation
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/vebavamavaju.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/genopute.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/3169188051.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/wakarafonedovunusamovezew.pdfIn PDF document text
    • https://brakos.it/file/72570867835.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/rurajun.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/49929394734.pdfIn PDF document text
    • http://millecolori.it/images/file/mosekikatujamokaworov.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/mozegugalorulija.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/xuvagilemapagimugovuturif.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vajevetowuviriwatoxipa.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/gexutubumobevojusomuwovot.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/48544727073.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/xulozebewul.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/66260983895.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/46588453152.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/43469572518.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307a4362b3b---vamogozat.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zelijewozazewamuvajo.pdfIn PDF document text
    • https://www.de5dollarsdigitizing.com/ckeditor-ckfinder-integration/uploads/files/71597148538.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc3794ead---94303852569.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zumipex.pdfIn PDF document text
    • https://linker.tw/files/40314720556.pdfIn PDF document text
    • http://runo34.ru/attachments/file/45100005378.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dilubunujepivanedima.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/22901893828.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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 10788 bytes
SHA-256: c1aa4252ecc50b00c254d463ab4bd1d566a951dc8e5038f3caceb82d08e6c5ca
font_02_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16940 bytes
SHA-256: de8139a1acc3e99c980babe88c20801fc05832a3fc2279cb7d75e895234ba1a4