Malicious PDF — malware analysis report

Static analysis result for SHA-256 374568b2fb8f7b7d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 02:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf5035e7f47e938281de328c39d8fe4d SHA-1: 9ed66bd444b373e5f03453c0718952533ba712d9 SHA-256: 374568b2fb8f7b7d1782ba4f656a3723317fd92ca2833bdd51ce387526857425
154 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains a URI pointing to a raw IP address, indicating an attempt to host malicious content directly. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/ziwojujatasaremegaf.pdf PDF link annotation
    • http://studioturina.com/userfiles/files/wenadesiki.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/xavevizivuro.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/7114132676.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/47428111715.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/wemazibejezupomokumetino.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/vasebikogukifisejol.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/80433777464.pdfIn PDF document text
    • http://jonme.net/ckupload/files/mumujiripuporikijoxole.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/keludaronitoraxiz.pdfIn PDF document text
    • https://architektor.ru/uploads/file/wabonofedupake.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9a280588---57878538520.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/23363707222.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/gopibib.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109140417038652.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109110444534406.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/62442955977.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/47203791471.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nakusibix.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/luxawaxupegavode.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/29789270043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+john+wick+chapter+4+full+moviePDF 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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 17188 bytes
SHA-256: d3a685f0abe5a5e633cd7bb83163dcf1bc54958bdeed6c5421d20f4c5581f62c
font_01_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 11268 bytes
SHA-256: 5e17c089ba226ccebc27edfe1e4135ea562175488bc783d5cfb83e7525749a90