Malicious PDF — malware analysis report

Static analysis result for SHA-256 68af42f7e70f34cc…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 18:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f538cfee0a53aa089a0bce2af53bfa36 SHA-1: 83b4ab8eea3d8009cbaf50dac50f6c510409ac13 SHA-256: 68af42f7e70f34ccc574904c8b32286dc6589e2488442944e4efdb801b1f642d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=night+cheat+gta+5+pc PDF link annotation
    • http://umffz21.ru/admin/ckfinder/userfiles/files/50161875155.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/61964304927.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/25564182658.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-12-19-51-59-j8snKJKe.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/kariteviburifakebe.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/38ncnetpvq3d6l70rsv71vkmoc/45050340221.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad73e17f6b---72180302438.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/vobojekowemarojesoz.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/21816070221.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/buxolobonaki.pdfIn PDF document text
    • http://tdbm.vn/upload/files/6952340669.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/35785798232.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/3011740170.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/79128059591.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/sigewonurupekusod.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/jabibuluzo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/55505542698.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/bikopinejixomutikupemon.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/8397261864.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/10686810843.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/kusenadegugu.pdfIn PDF document text
    • https://123natura.com/stockages/files/vixapevobez.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/30844025600.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_off0000af79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 18212 bytes
SHA-256: 5207dad7c64892fefebf752ab772e4acb83e2cf0ca0309d32d961bc7fe386b82
font_01_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 10228 bytes
SHA-256: 24857532e5fa18d32558624e5d04d06bacd2e2bc91659d67758d90c92fb2a422
font_02_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1