Malicious PDF — malware analysis report

Static analysis result for SHA-256 df94010d1536f51b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 09:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 409c9ec031dc66f7ef52b6b9cc9c69da SHA-1: aeec92d565d8acb4751b6f00ed90479c873fa96c SHA-256: df94010d1536f51b0ac5675577a5f1ebe4cb57981b2a04ad40390c6ed342220d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a high density of links on potentially malicious hosting. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://membranekeyboard.pl/_data/file/gunasejimi.pdf In PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/82352852332.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/37913997139.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/24594339161.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/nidufebuze.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/xipevuwa.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/wajojumil.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/823559858.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62688966746.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/98462157288.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210911_005739.pdfIn PDF document text
    • https://amgaa.org/temp/files/5667384630.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/79973774761.pdfIn PDF document text
    • http://potya.com/fobadu.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/80885416942.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/969e2e5e8f6c7f2d9a20cb1a1720055a/93076969318.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/vojorodajev.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/7557026228.pdfIn PDF document text
    • http://yuha.be/_files/file/zerafikamasevuwivaruzil.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/10666152517.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jiroxigefogoradamad.pdfIn PDF document text
    • http://gibisch.info/files/files/zozewubaviz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/toxutabifo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6c7d9147---fafedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=watch+valkyrie+drive+mermaid+online+freePDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 10836 bytes
SHA-256: 7bb86024a428667f094dacefec83faeda1c37c9cfdcc56b3866c5de5dc0447d9