Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0611e00adf7ad2…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 02:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 329006905cac24c47c50b30a598e6c81 SHA-1: 4e09dff2b63d0374c938c50501121a7543f71017 SHA-256: bc0611e00adf7ad287a3a8f9459fe10ea3f7a22e6d84f62ee513602359f39489
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of a link farm heuristic further supports the conclusion that the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/72920576009.pdf In PDF document text
    • http://msiutilities.biz/documents/26310456113.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/99601273359.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/kubasi.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86306186424.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/8972785658.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e38d66de484aed40c30772977f35e42a/69994028446.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/tolasulupise.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/pegefubonabor.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/zevoligan.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/19559987890.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/jakevoniluxigarakafiben.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sexevukonejuvopegivisefar.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/livovixixite.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/41422779653.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/25843104492.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/97743544108.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gn1mo0t81jk2tqg2s2uj6u9gf3/juganenefuzojide.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/xoxidekupamukuvomebugoje.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/zitovisudagisipojos.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nejofozu.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/56547382582.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/wuzipuvep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=paragraph+with+transition+words+examplePDF 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 11028 bytes
SHA-256: 3090f0df42e64cccd6195289af13630ae53ab48284ab4a856b5ad910a9966e2c
font_02_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 17520 bytes
SHA-256: 50403eea97a8c137a662f5acd3cec96ea07bde75fda091eb61f2dfdf7dbd6f8a