Malicious PDF — malware analysis report

Static analysis result for SHA-256 671a8765a0014bc8…

MALICIOUS

PDF

78.2 KB Created: 2021-10-14 09:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 342ebcc504191f98cb9f44e4fbcdf658 SHA-1: 8657f0c89199b3278df37793be083ff1a515c838 SHA-256: 671a8765a0014bc889bfce6761f833288616153c84aea946d58a304352a6137e
146 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a number for fake issues. While no scripts were extracted, the PDF structure and URL patterns suggest it's designed to trick users into engaging with malicious actors, likely for financial gain or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.advokat.com/app/webroot/img/fck/file/80780414299.pdf In PDF document text
    • http://ukwoodrecycling.com/userfiles/files/56325122718.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/43434811399.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/99861528884.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/41377062345.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/ziwiriba.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/bigisevipubuzute.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/23287691275.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/mumagatogulurotugatebomid.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vaxozigipesijoxunav.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161576643252e4---kokelozifofotimowoxexoziw.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vowijorukavetafatig.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/figakogawefafuret.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/gegoluganekedirovez.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/jewedub.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d1049c0d---64596110875.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/BcFPVxLj4jw/uplcv?utm_term=2019+tamil+mp3+songs+downloadPDF 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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 11124 bytes
SHA-256: 647b8f6f9acf7e1d20a2a3bbdf1931a3bb856970adee8a56e7f82fe709fe28c1
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 17612 bytes
SHA-256: 45a1fb91851dc5bc71b5934a424b26ecb8830f40b35bf499d85f19312579e088
font_02_sfnt_off0001140b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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