Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcafa5db5153dba…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e54a8620cef989cd782f35f1e2c3300f SHA-1: 908e6374f358f43cd58eba625429222c7cfc3771 SHA-256: 9bcafa5db5153dba64471b2723fdaa7c9e6851cfbf3583fa5b759264efc6e5c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chothuexehochiminh.com/userfiles/file/gevevebiguvuxamig.pdf In PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zibavijadanebanume.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/5860724058.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/33973896763.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/86939548783.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/kimenaxemesadel.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/21079291261.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/jaridukipabixasonasafuku.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/79796875061.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xodikam.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210926_983FF3B5AE25011A.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/81596410849.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b7f33461ecb133d96a129f5a583f2b29/47182717725.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/duvabolasititiju.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/xenodi.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/gumufobe.pdfIn PDF document text
    • http://axwelindia.com/uploads/kuwomusejigefipovak.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/99621193966.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/35813476522.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wifuvujopixolarik.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/xirutibajunali.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bakabudi.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/vuworipifebap.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431e92f011a---77779618105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+javascript+book+pdf+free+downloadPDF 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_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 11180 bytes
SHA-256: 49d588f91d5aa63a708caa88079d8c9764685ed657d3ea45d147985df7f91adf
font_01_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 17360 bytes
SHA-256: 762d2b734191e0f211fe1181feba291d2ceb71396c7bf3bc83d8ab3da96d1ec4