Malicious PDF — malware analysis report

Static analysis result for SHA-256 773caea741bf27ef…

MALICIOUS

PDF

76.3 KB Created: 2021-09-10 03:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2fc074eae2b84e11dd4721b24337a3ca SHA-1: 5ebb56927ff689d0c90d69b8a81ca1b114ce4b11 SHA-256: 773caea741bf27efc2dc4b0fee51cf2cbf61de88aadf2781129f8b423564d301
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to a collection of potentially malicious websites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://mygoaltv.org/ipp/images/uploads/files/kuwuzozose.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecdf48c6d7---nufataketemujevo.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/basobukatajir.pdfIn PDF document text
    • http://email-database.info/userfiles/file/selimimakonoxiv.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/95249799859.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210908135223.pdfIn PDF document text
    • http://watch62.ru/files/files/bulemaxonirez.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/nevajesesanakumajax.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/16721548900.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fikomojino.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/73982850708.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/vuxamumijav.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/luruxuxozukowatigufo.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/47992570451.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xivefibuxotusat.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/rexesitaxedi.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/vozozowefetiropido.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/kelawifo.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tilibixofi.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/wunafetodafev.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/wined.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/40537139175.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a829e57101---bivew.pdfIn PDF document text
    • https://efnnma.org/files/file/24880030786.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/xisasuparubulevi.pdfIn PDF document text
    • http://canvangdientu.com/images/file/sepeliwara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mass+effect+on+androidPDF 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_off0000c6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CC 10416 bytes
SHA-256: d99471c64363edc245d42f530a4437c5bce91d15d57cbc04b9069335fd23ac4f
font_01_sfnt_off0000de8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8A 17308 bytes
SHA-256: 7958564ccac17c0e67d27db5cabb69353329afa63841a79cae72bc1c0ff5707e
font_02_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1