Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb21c934f22d1d0…

MALICIOUS

PDF

63.7 KB Created: 2021-09-24 07:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c238fa0c318da0efbb563ccf4ccfebcc SHA-1: 1525cfcd2589beb900be8713c82c996c4d2f9912 SHA-256: afb21c934f22d1d040893f03ae98b68d03fb63340ad4acaf67db8f4d122d029a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the file being a link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

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.
  • 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
  • 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://drafthe.ru/uplcv?utm_term=skstream+films+et+series PDF link annotation
    • http://galenbio.com/images/upload/file/6835204061.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/241vo1jvp60gnd15gb4bvvant3/foxapir.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/xezetaxiganelajeliluwuli.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/likid.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokikukamorivagotogizana.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/70003326380.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/jajuzudenigexenobebux.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/paxasekekazuxofisutidupo.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/80405914414.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zuzixowefidomesito.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/garodexebinisefokozoxita.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/42677960962.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/88240473229.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/96581536016.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149f549c9795---derokazaxigelodilem.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/wivib.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/valixol.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/ferunuvajufezawosaxipu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/vozekovepikeniketu.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/59321013355.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/50928051491.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/38242770288.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/84528234801.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/goxibuwuru.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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