Malicious PDF — malware analysis report

Static analysis result for SHA-256 b457d27eeb06dfd9…

MALICIOUS

PDF

87.4 KB Created: 2021-03-11 17:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 68595e30a43c3641d2e2c3403eb113b9 SHA-1: 2ab43c621cb0a4c4f840ecd7cbdddbc411a056bb SHA-256: b457d27eeb06dfd900c6bab5c0f44f45d7573b88e15697113722a92a81ee0234
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The 'SE_BRAND_CREDENTIAL_PHISH' heuristic indicates a lure impersonating Microsoft, directing users to a redirector URL that likely hosts the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://susuravi.weebly.com/uploads/1/3/1/1/131164319/vabemu.pdf.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jottigo.ru/wix?keyword=vhlcentral+answers+spanish+2+lesson+10 PDF link annotation
    • http://boforotaje.mywebcommunity.org/lev_grossman_the_magicians_series_books.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/garmin_vivofit_4_battery_price.pdfIn PDF document text
    • https://susuravi.weebly.com/uploads/1/3/1/1/131164319/vabemu.pdfIn PDF document text
    • http://online-bestshop.xyz/rovilamofowuzedijulizuf81hua.pdfIn PDF document text
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/4971742.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/sex_education_season_1_recap_hindi.pdfIn PDF document text
    • http://jakartapro.xyz/basler_usb_camera_manualhe4tz.pdfIn PDF document text
    • http://procripton.com/muzixibunukdmfc.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/how_to_unblock_the_hose_on_a_dyson_ball.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/which_engineering_has_highest_salary_in_kenya.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/nubexurif.pdfIn PDF document text
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/zasafatuwo-zoresixosixirex-nizadivol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_98c84a0b9bd841c68e38b8863caa1cd4.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/2601861583.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_29d3b458719045eeaf453fd1c495522f.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ca12d646e3164f25862d2137d7d1aed4.pdf?index=trueIn PDF document text
    • http://zutugidod.onlinewebshop.net/25124288362.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/cyberpunk_2077_stackable_mods.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/99264813076.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_f19eebc6acb747c2b769dabc46fb7d47.pdf?index=trueIn PDF document text
    • http://gakilasefit.myartsonline.com/bibliothque_lectronique_du_qubec.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_eba9eae1751140aabf5aa4d8499dd746.pdf?index=trueIn PDF document text
    • http://pazepoxi.atwebpages.com/cours_d_agriculture_tropicale.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://scripts.sil.org/OFLIn 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_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 5404 bytes
SHA-256: ee9a70da6ab7bbabe766b883827d6295b50cbbfb2a4502ce4172aad519f73dd9
font_01_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 11244 bytes
SHA-256: 6d397a82c1e94b6a69557cbeaa7100e1292083b2251ab47d91562b8a2da43ad1
font_02_sfnt_off00013af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF4 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b