Malicious PDF — malware analysis report

Static analysis result for SHA-256 e501204ef8f94277…

MALICIOUS

PDF

87.9 KB Created: 2021-09-21 02:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48413a3b17eb4cfdab3f9f5bd669a15b SHA-1: ac10bcbd135409b903a4fd568a53cbe28e0acde4 SHA-256: e501204ef8f942778c8d4c2415af7f6dc9f0b916def150c8610a562ecca10068
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable domains, acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination by using many redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=watch+paid+in+full+123movies PDF link annotation
    • http://noxsun.com/jingkelun/userfiles/files/20210914045217.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/24e53e8e27d4d77362a62acb989e9f4f.pdfIn PDF document text
    • http://jonme.net/ckupload/files/getuvopajerurujup.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/44240582700.pdfIn PDF document text
    • http://axwelindia.com/uploads/kuwomusejigefipovak.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/69736888900.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109022325538493.pdfIn PDF document text
    • https://chilepools.com/contents/files/makujagomav.pdfIn PDF document text
    • http://fpole.ru/sadm_files/fosimebe.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/buwowe.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/tinetaguvawovuzo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/levisubikegowezulutixaf.pdfIn PDF document text
    • http://nature-revive.org/files/file/77988201972.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6f454687d300aa22b724340c725857f7/29283194885.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/lorugitibevadijo.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/75925738352.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/tibugowoguxusazebam.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/68416775907.pdfIn PDF document text
    • http://status.cz/UserFiles/File/46704952853.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/20831761827.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/17159897689.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4cc005d97206a76d73ff342bd07eab66/43380627571.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/simifasore.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/pimis.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/78771271289.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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 11288 bytes
SHA-256: 91855a219b99a2624d1e12024a77094ec55c756b641e991976fd00246b35e148
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 18688 bytes
SHA-256: e5226e1baa1e079ee636bd3f174adab1784f1bffc3f85de1341561abc00e9bef
font_02_sfnt_off000139b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1