Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44b4f4ea1217f1b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d797f938b47b312a45d30943e5170a0 SHA-1: 39224e5b4aa9e5a0dbd2f5da7839ccca9ef747ea SHA-256: c44b4f4ea1217f1b8667d1d0ae4e7b62e3c070844090dc4c9b7b5938338c277f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gianlucabruno.it/dati/upload/file/84198264958.pdf In PDF document text
    • https://best-label.com/upload/files/88287510003.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/nidakeputajerikokowadusol.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/mowulaw.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/66324992469.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/61049201063.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/liwoguxiwekuge.pdfIn PDF document text
    • https://sanagustin.cl/files/19694381130.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/86748465429.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/92274332045.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/geles.pdfIn PDF document text
    • http://rentaruedas.com/files/others/30761977129.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/15208532251.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mkcca1vc36f6osl1gp0j05mao4/bezoropewenepizexid.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zozozi.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kelejem.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021093018375185.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/dipivinujazejosuk.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/jeferazawutumivuluxuduru.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/runakik.pdfIn PDF document text
    • https://granitnet.hu/editor_up/tanogimataxanila.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/wadotefulunaf.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/jokixasilulogibiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+android+navigation+app+ukPDF 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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 10832 bytes
SHA-256: 88dc0c646ae59ca90679529a963e4f7b55e4251217066a43f683fa41c3fcbd1c
font_01_sfnt_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 15576 bytes
SHA-256: 76d88279ce8ed166d07a9b391c4b2357052a7e765a19503a508da05edf62c75d
font_02_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1