Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd91778cbb399e8…

MALICIOUS

PDF

75.2 KB Created: 2021-10-01 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 019658ba0e0e97131d1e8fd4b962e928 SHA-1: 25195ac8acf46dc98ec087d65a0549a5056a2c9f SHA-256: 0cd91778cbb399e806d3ad88ed02414b6339a86aefe9ddee856ca0bbf591efd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=chal+mera+putt+2+123mkv PDF link annotation
    • http://edukoc.net/userData/ebizro_board/file/73571398501.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/36033952788.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/dujaboju.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143465d58223---24770882704.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/99360618763.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/gasebusisi.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/12453727301.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210908_2D0BF505425AEEEF.pdfIn PDF document text
    • http://salonrowerowy.com/userfiles/file/vekanumofa.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/pokono.pdfIn PDF document text
    • http://xn--evdebakmhizmetleri-k0c.com/uploads/file/wupopof.pdfIn PDF document text
    • https://mar3ol.com/Files/files/sulapopivedelitezu.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909165947.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bufutajexonet.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xowimegasuwawosonetozoz.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/jereta.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/95556478798.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/xajerulajopesaweturanor.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/gasanabuxudewutek.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/jejezagujovibitamoveduf.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/duvifekubanupejudodidivaf.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210921_A45B9EB495A009BB.pdfIn PDF document text
    • http://leruichem.com/upload/files/38512874655.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/mufajigolitezif.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_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 10664 bytes
SHA-256: 3f2121052d490226d66b470120b3d50bc665b84d46bbd5a00e1d7bd3d1e63f10
font_02_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 19056 bytes
SHA-256: 74cbda89ce116517e4b1c4f62126c1c9883fe4390ad02ac2ef9206bcb3ad6240

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