Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f53a75069c68aff…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 06:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8190d3eddc266e298d933bf4e9c10280 SHA-1: ca44f261803e68aaa8fb771f2dc9b4151beec225 SHA-256: 0f53a75069c68aff651b73cb6aa31d030dfc940e108a3425523b747716a87edd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to other PDF files hosted on various domains. This suggests an attempt to distribute malware or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nbkhjc.com/uploads/202109/file/210905185656420429p162xfvudxgk.pdf In PDF document text
    • https://gianlucabruno.it/dati/upload/file/23690407583.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/difugekojaxijomimi.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/50621142069.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/25393423224.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/46364142115.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210912180308119.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/5174746019.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/36929981953.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/mavutepitoxutezijefebek.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/30234190302.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/60144160659.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/77908991959.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/sodididawaxuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf34362a8---gasomodamupuxofedanar.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131630a8ce09---deravofiwanokusidowanu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tafunujetikebovev.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356096111e7---53719089424.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/13420093379.pdfIn PDF document text
    • https://lazerom.pro/media/file/65356083005.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/boraripupesemujodovasov.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/40889529241.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61344d8402a0f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=offroad+online+rthd+mod+apkPDF 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_off0000be2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2C 10712 bytes
SHA-256: eb48cac14dd1a8d289f992bf37081862f1763b5356a401847680a32f7d19ca15
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 17340 bytes
SHA-256: 72713f0b9fcb4bcb8f3964791d1ed89043f4fae40e9f9ec4005b10cfe61961ca