Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e809a484854aeee…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 06:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b537e048641a749e5882c17827e549f8 SHA-1: 281304914a493cca2c44d5dc2cb01626267f1067 SHA-256: 3e809a484854aeee1ee703c4e980d8f828d68ef537e40bcfd942931c98a9f19f
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which redirect to other PDF files, suggesting a link farm or redirection chain. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a business email compromise tactic. While no scripts were directly extracted, the presence of external URIs and the nature of the heuristics point towards a phishing or redirection attack. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://huntic.ru/uplcv?utm_term=how+to+delete+everything+from+android PDF link annotation
    • http://ideatity.com/ckfinder/userfiles/files/39565586962.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/makajefanatiliziligikolib.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/98693389161.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/38801750211.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/gusupibi.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/dowijekaxubiwuwoji.pdfIn PDF document text
    • http://salt17.com/userfiles/files/rezezorotovugoxesufureg.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/jolafawojeru.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133c871e7021---94415712656.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/xasisegivetitisa.pdfIn PDF document text
    • https://el-tall.pl/pics/file/2710274592.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/kubetado.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/ginurew.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/vomeg.pdfIn PDF document text
    • https://isleo.com/i_photos/file/widesunovazafi.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/96959823705.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/jitamajon.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/17425034435.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b9ebd7f---59858409999.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/bijoxaxubaduzoniked.pdfIn PDF document text
    • http://workontext.ru/media/file/71062412657.pdfIn PDF document text
    • https://nomortiga.com/contents/files/sigutavil.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/nuzazarukidowonakosepula.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_off0000d7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 17556 bytes
SHA-256: 3e6afc4dc5a3ac6ec9d4178a3045660616cdae18a58a47692ff77e3d938bb804
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 10888 bytes
SHA-256: f0cc10d76dda2b7a05d8131098a1fa72b2ea1fe507c194fba06abaa81b949396