Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc652789ee8efba…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 20:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3bef360b32e3ca0b0569bf7853ef453e SHA-1: 76f6e918daf386e2c42fbcc9b9c8b4af71edb55f SHA-256: cfc652789ee8efba82ddf36c0dbbd73a152acdf076925aeb16c0d51bf617d0f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document as a lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fundamental+of+electric+circuit+6th+edition PDF link annotation
    • http://dubilex.com/userfiles/files/25143366856.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917223720.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/xogawatizosawu.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/zanujaguliwofud.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/30490019691.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/74015994363.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/48437755905.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/95405441285.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/42286977703.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/refaloxokukavusoresiwazu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148c5a23a860---mowilusekel.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/nikobepegijob.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///gatanojudapezexor.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/31275055048.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wunusivajugas.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b95288122---wirogejademapojujuzodi.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/54853632121.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/musiz.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/duvibokudidovivug.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/norunenopofugubada.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/75852140436.pdfIn PDF document text
    • http://whatdwellswithin.com/file/59997261633.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/56040743818.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_off0000b501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB501 10820 bytes
SHA-256: 0abdd3d5995987994ea97f993812b01a3c30a675a8d6668c261ba8312cdf69c2
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 15368 bytes
SHA-256: 19a0b5d6076658c48af6f6903a3e7e0caf7c8bffc4c86519c2f96af2d2941b94

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