Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fbe85525101140…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 04:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d990578aefcf0516da72a102782884a SHA-1: 2a4fafe3fd7c390941fc10626bb23705f1933c70 SHA-256: d1fbe855251011408110d51c76c2d56f67739c0e3a47c401b6d42caa4b999072
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a redirector for content related to 'masterchef australia'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution motive. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=masterchef+australia+season+7+episode+1+watch+online PDF link annotation
    • https://seikai.jp/free_images/files/87334718720.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wiwixobetenejo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c1f36cec87b5e5a847ff70256765bea2/73071440319.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/75890768733.pdfIn PDF document text
    • http://nenorm.com/files/files/jebetumuzevo.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kibog.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/pigolol.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/38767902264.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/88189458801.pdfIn PDF document text
    • http://ellev.fr/upload/files/43701204595.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/finolomuruxixirafabagon.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/77131591127.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purasisutijijanenapus.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/nozugekazitevigesiga.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/64390478707.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210909011049_4lj3ct.pdfIn PDF document text
    • http://usagimatur.com/files/others/22222214319.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/lonatemekolagiwibudi.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/bepofanabivuxep.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/2331266794.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/kimokojo.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/35171493648.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/31639546395.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/duwekufufarozi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec559b0b9---60850273204.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/geluxewiduzux.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 10996 bytes
SHA-256: 7f038f389121cc56adb1eb396fdb7b374170030c03ad0d6676c9ab9fa0aa5f20
font_01_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 17120 bytes
SHA-256: 4d5a82fdb59226c305c92c7ee1556f10badc6c3142127879c69b825e37e8cc0d