Malicious PDF — malware analysis report

Static analysis result for SHA-256 12adc54bf75cfdbf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 22:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0d515631d46f520cd3c0775ebd94819 SHA-1: d96fd58a9b1cf27fcb70f952acf39a573f58bd77 SHA-256: 12adc54bf75cfdbf688b85052f2e1e65265783318ff7abbd0bca67810bc6c485
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://k3projekt.pl/uploads/userfiles/files/kefetitugafosuxapukom.pdf In PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/lilepubezixu.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/wuduvowufewovaxik.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/bexejinuxajelofapesepa.pdfIn PDF document text
    • https://rjpexport.com/files/31297673044.pdfIn PDF document text
    • http://kleiberit.ru/files/file/bunekovukamudilaloguzok.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/sunavidixitovogunije.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/xokuwefivolevixasul.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/loguwijoxitewojidi.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/barisiwuposuwunedapuli.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rigowox.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/nobome.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/28549242886.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubivl9k801fjq97h9983ea6i3s/jedotadur.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/16500822794.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210909071550668.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/vunibur.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/70690947704.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/81702033788.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/wupuluwinonurulamusuref.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/dewubasasukulale.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/defiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bendy+and+the+ink+machine+free+download+for+androidPDF 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_off0000b9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AB 10916 bytes
SHA-256: c3e6940c5490f992e1d0200894bf6a99bdb99c0473fe17bbd09f99a14db2be53
font_01_sfnt_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 19464 bytes
SHA-256: 8cc5b9a191e7317254af9af84afe773405c88380a356809c4f2100e0820767a9
font_02_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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