Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc16de2e2951f54…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5efb08466f862c185dacf887c7d18d2b SHA-1: f37b1774b5dc59303aee8dce3210d816ccac2f9f SHA-256: 4fc16de2e2951f54949eab1267dd97c528c3d38d9b863a3b507a9e38c8729292
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://huntic.ru/uplcv?utm_term=cara+mengkompres+video+di+hp+android PDF link annotation
    • http://master-sign.ru/ckfinder/userfiles/files/vuzamawepogepuzapariz.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sufivakunu.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/pokizunajugukalonanagij.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/78613772677.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/poxego.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/5149677846.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/4636190341.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/45512877975.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/75201385415.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/pexanujoledarulidororex.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/66172503428.pdfIn PDF document text
    • https://panama4d.com/contents/files/ninasogidafuliduzovowunir.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/xumutufib.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/6341764927.pdfPDF link annotation
    • http://185.33.116.145/~acus01/upload/files/48050064388.pdfIn PDF document text
    • https://digicpictures.com/downloads/penimozimijugazazejuguvo.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/vipuvisiseleputeri.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/27917351535.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/suzizerazasipedorubo.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pewomokal.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nopulatexeso.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/46971992652.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/gavivu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141848792080---23857400368.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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 16656 bytes
SHA-256: 85d912229b7b8a275255ef0eaaa295201da85329ac339e4dd1630796fe25f847
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10884 bytes
SHA-256: b04b75f7d7019d7d80e3c36e0ff9ce622fa551c2be003d093fd4755e89a687c7