Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4bd6cc0bf8bc6b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 04:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bac0e3f536b9de65f7dbe4d725fe431 SHA-1: 8e521383724a0afc796253316a0f0dc6324fa658 SHA-256: bc4bd6cc0bf8bc6b064d0e5ad52a520a28381f4f3c5de22943b3ca043d19ceee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=123europix+friends+season+1 PDF link annotation
    • https://sbsoftware.ro/admin/userfiles/file/gavipogajexude.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/63317404138.pdfIn PDF document text
    • https://shunnasato.com/57531076500.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jg1kt65e37m2ba8kkkfddk4p60/58837225453.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/12359682016.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909003009.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/mebazaxobatewavedubo.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/ritebogexotusoxepajolo.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/65833353131.pdfIn PDF document text
    • http://chinalabware.ru/d/files/41836981522.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613276a8c6f97---dokolavekuwezuxejabaxawix.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/ratewuj.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/66960103750.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/katejixovunofupekev.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/gexapizijen.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/purepuwusufatulufit.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/lisadera.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/rakopinoserix.pdfIn PDF document text
    • https://durimawar.com/contents/files/lozezawidamipewaxazikolod.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/90246973871.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/towazewifexezozodose.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/jonewogufa.pdfIn PDF document text
    • https://path.mn/userfiles/files/wotupeguxitupuz.pdfIn PDF document text
    • http://myphamasia.net/upload/files/46212059770.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109062010209335.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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 10796 bytes
SHA-256: 06e40a839c7bcb4e4f2700e5269f24c575f172e8b76dd9dc5a9624bad8c4ce60
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17688 bytes
SHA-256: b6492582105b76be93a34b18985e8ff48418b39b9430acf36981da7f932a94e6