Malicious PDF — malware analysis report

Static analysis result for SHA-256 8673934af62f7bca…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 01:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13ffd04ccb75a11cd5731ca8a176cbd8 SHA-1: 8f56ea5c847bf063d455e41e65f94cb848eb415f SHA-256: 8673934af62f7bca192d25f5d940782a32771a83cff3ff3a67202c3bd93f5840
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting. The presence of multiple unknown reputation URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bckbytow.naszbip.pl/img/upload/files/11920819200.pdf In PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/nuzarinolakip.pdfIn PDF document text
    • http://grupophi.es/uploads/files/87486156107.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/fofifinebanuvisewilon.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/jamopesorufolemus.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/pozimuda.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gdmp80995ltv3dc5gfffb243s4/95713035256.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/18953866904.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/vezemebixefoxarom.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/28993947986.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/26372296620.pdfIn PDF document text
    • https://hirurgija.me/files/mijigajusogin.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xebezazop.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zewofimebikuragole.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/vujuke.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/tiloxilozisofisigosiram.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/pijuba.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ganuzitaxitu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/51768323604.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/junipesokinipukuxanoguwev.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/96011552527.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/57729845843.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/wenonujigegesolupofiser.pdfIn PDF document text
    • http://mestan.by/images/file/71606773452.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/45093602474.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/vakonaxi.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8f167358942b0f4d6e0ed54102e374ea/lenudegudugiwikuvofexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=x+men+1+charactersPDF 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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10296 bytes
SHA-256: 2db947a9d74e797871ffa4187105e1f580917ce199b0f81fd0f202f92a2a012a
font_02_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 17872 bytes
SHA-256: e1ce07179ce90d3d07b389539b837962e669a3ab5ed4bea6564b5701de01e6f5