Malicious PDF — malware analysis report

Static analysis result for SHA-256 df46f5ca75dd6c54…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 03:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd6443c1a7d2e56fd178977d0e943e88 SHA-1: 46c26cad1316385b54b91deab84e707b072958d8 SHA-256: df46f5ca75dd6c5438f75caa3e17225108390bdae470c515e51575d23922c9f8
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. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://abwva.com/uploads/files/94037965050.pdf In PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83261426861.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/39211588368.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/vovotuvinilebenosulilebo.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/80509371425.pdfIn PDF document text
    • http://prograsifkalip.com/files/61128733457.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/xizofifaxidumozizeja.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/61004730710.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/zelipapalaw.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/nufoworofe.pdfIn PDF document text
    • https://jotelek.hu/files/file/17576084285.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/lijub.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jufenuwuke.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/topowata.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca808b127---mupidirix.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/jevufofalafatusubo.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/82066883863.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/9054387149.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36340055865.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5658fb1---49133774859.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109050911489201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cobra+ultra+iptv+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/71762650775.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 10272 bytes
SHA-256: 4d4697e0dae248dd5e9ca4d0dd51526ad3c79dc03fa53c9519b6a56bf203836d
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17868 bytes
SHA-256: fabb379db1023533616260dc637451c8a005ca972ded03f8045985c6a96443f4
font_02_sfnt_off00011d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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