Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bc68ce7854af48…

MALICIOUS

PDF

86.9 KB Created: 2021-09-10 01:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 12031e081a0a5194bad21e2f84b5f7d9 SHA-1: e4f2d012b27637daacaa31d10e8507be87a20d69 SHA-256: 31bc68ce7854af48aa7e1de6ff1a4bee9aaeb7d74f63b2ea86cb01c1742d215a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://ramenhajimetustin.com/uploads/files/70538326106.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/upbt3lda16bj21n614e3c96p61/lonilegekejesujujojato.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/86852735473.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/53069855887.pdfIn PDF document text
    • http://cssh.es/img/file/getanoxijufejo.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/94828513506.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/b67d997e451a46f66581904921b4606c/30502340515.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/fisosomibavej.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/93976036369.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/65017902652.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/68521883528.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/8541526492.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fewikedijezudivu.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/fizitokemadaruwotome.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • https://2winit.com/Files/files/seresuzalegabepesiz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135a03bd3f0b---xositinikos.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/58373965454.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/zekuko.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210910_052457.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/84350854583.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/rusarifabuxasugobuzobilam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gradle+out+of+memoryPDF 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10404 bytes
SHA-256: 505a3b3826db9888e62e27c3cf35f5ed81e46269612cf628f05639fb33ab8e8e
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 19268 bytes
SHA-256: 77dde06e430fc6aab18608daa832bb60e1b7e6eae7e80074ceef7e4497add4aa

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