Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ffb97d70b07ad9f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 08:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12a74aa0611dc6dcaf7cc1be6b12cf4c SHA-1: bfb62327285bb435dcbde5c24b2990c6ba4ddb1a SHA-256: 3ffb97d70b07ad9f50e3727267358874413488109af0bf18c7e3ba6e0551c873
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://faradbox.pl/files/file/60291723817.pdf In PDF document text
    • http://akvatoria.by/UserFiles/files/lasarewizikudebiz.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/bijiso.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906034614.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/luzopefovaxudubame.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/zozuxafuwovaja.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210907200433.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/13031735204.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399401dcbc9---ditimezefozasiseripu.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jerufopimese.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/2716981655.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/jukogowanodigekimavaru.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/40124607858.pdfIn PDF document text
    • http://jucal.es/images/file/tabirujilefefariwip.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/41978171403.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/85214759095.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/dakezifiwuvanowonivuz.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/14474646782.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901122928.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/jawulidelariwulirilese.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/bubetizadato.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b47f0051a---bojegigano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=it+happened+at+the+world%27s+fair+full+movie+onlinePDF 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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 11000 bytes
SHA-256: 4c47ab068fcb2091359156d4e0ab5c9ea00cc922540b3f122bea3c7ab6af40fb
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 17848 bytes
SHA-256: f187b75f1363f1581a9776525abddf87b265e9ca05283c2d9c384ceaa3c91fb4

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