Malicious PDF — malware analysis report

Static analysis result for SHA-256 541c975ccd8baead…

MALICIOUS

PDF

78.0 KB Created: 2021-10-21 08:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 325127e9dc2a29b2b3f99b5680c6a9a4 SHA-1: b5fefc9fbcb076ad97779860e35f6a92da54b96e SHA-256: 541c975ccd8baead16be5fb50c292ae20a1ef584968acd8032ad50021b8b40d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the PDF's primary purpose is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vasa-project.org/fckupload/file/todulatamiranetezavet.pdf In PDF document text
    • https://seltec.io/images/uploads/files/tomivovujowesebonanov.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/163543b8996099e2c354f592e75e9b14/kifonalaro.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/figoworogenekolan.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/piwaxokovegazapopekekor.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/80340687846.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/takibuzunupinadowalebakub.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zigesojexolu.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/67509709246.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/timunis.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/17557724722.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/78781302010.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/80830966595.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/26555859550.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/89384282493.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/82193579423.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614707122f536---77293466241.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/84876101380.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/kijodok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=supported+lipid+bilayerPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/nupelemukeratojavalibisuz.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_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 10540 bytes
SHA-256: cc1b530a4aebcb96f8c9214ac5cbb92c467ca9cc20dab6b60c3dd88cea8924ce
font_01_sfnt_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 18836 bytes
SHA-256: 5f721f09c73c3aa175b08d4b9e875ece3488c3b038d37156bbca6e2a9f52cd7e

Open this report in the interactive analyzer, or submit your own file for analysis.