Malicious PDF — malware analysis report

Static analysis result for SHA-256 6617c4672c4e9399…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 14:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd0fba034a82e78caf2169d8e2f8c134 SHA-1: 62e88e76c4f08c644da4d77e13b843334ed0ffec SHA-256: 6617c4672c4e9399d00a6db9e8b843839795a90711e3f48e02da06fbd6d096ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URLs, strongly indicating a malicious intent to redirect users. The ML classifier and ClamAV detection confirm this, flagging it as a phishing or trojanized PDF. The presence of JavaScript suggests an attempt to execute malicious code or further redirect the user, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://ketchas.ru/uplcv?utm_term=keypad+phone+theme PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a7db194---44605816813.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/12839322040.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/79452570862.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/59528117117.pdfIn PDF document text
    • https://adikmanis.com/contents/files/pusawamajevizesewi.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/zijuguf.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/xujomuvazagugajo.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/82849844990.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/34153236428.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fisemenolenorer.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gatafirizapisijij.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/funigatibevu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/74520026911.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zutunufebikuxifo.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/30709562685.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/josuze.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pemuzadutoji.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/72617202022.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/13108891343.pdfIn PDF document text
    • https://udruga-invalida.hr/files/60679092545.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/93332863867.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/leriniviwasudowosekododoj.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_off0000d2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CD 10356 bytes
SHA-256: 8368c311737025bf462f84eb04eedeff78aba94d7b8ead02c7831087242d45d0
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 17016 bytes
SHA-256: 0b6491692497a61dbcc6462fb533e9f133bec0c35b3f27b357eaa814df5fe2be

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