Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6bb61411ea72ea…

MALICIOUS

PDF

85.1 KB Created: 2021-10-04 18:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c96c2268bf7a49fc3919cccb0b4f743 SHA-1: b3b02362d6c12b5958d49ad99eadc015586eadc6 SHA-256: 1d6bb61411ea72ea08b34fa1805edca35cf5e634b7abe9fe33196dc6cecd396f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm on disposable hosting, and numerous unknown URLs were extracted. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://ok-poland.com/userfiles/file/23489560741.pdf
    • http://telektrans.hu/editor_up/39482270310.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/11279198099.pdf
    • https://anninhsieuthi.online/upload/files/digeteme.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a6516a133a---4861912536.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/nopokanalulupewopifore.pdf
    • http://jan-fotografie.nl/upload/files/98814793233.pdf
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/zepabedupuzazivajasoj.pdf
    • http://genbreedpublisher.com/files/upfiles/file/13464744819.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/najuratusi.pdf
    • http://phanphoiongnhuahoasen.vn/upload/files/94996940562.pdf
    • http://wronba.com/uploads/wysiwyg/file/12611534617.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/75902566335.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tutabewujadagib.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614509a1d74fc---41074316250.pdf
    • http://tantos.jp/js/upload/files/50844864257.pdf
    • http://1night2day.com/UserFiles/file/63999939227.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/58299369417.pdf
    • http://mawaevents.com/uploads/file/fakowudabanisedubura.pdf
    • https://mattress-leader.com/media/wotepimexedu.pdf
    • http://ihdbd.org/upload/files/69039315894.pdf
    • https://pernambucoimortal.com/imagens/files/54181860701.pdf
    • http://etre-belle.su/images/file/temekidasu.pdf
    • https://vietcuongcorp.com/uploads/news/files/42377884688.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210906_02E0DC01FC6236F7.pdf
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xawumomijakudulovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=career+goal+statement+for+graduate+school+examples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e7.bin
03ea4ac9cdef33c3dd75993ff67f0aad1d656542e5e017a605f4cdc6083d2612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 18944 bytes
font_01_sfnt_off00011409.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 16792 bytes
font_02_sfnt_off00012c20.bin
c27edaee5df597b31ebec697131dbe9063996abe9fd4e9d837b8daa3496baded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 11208 bytes

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