Malicious PDF — malware analysis report

Static analysis result for SHA-256 892d5c185fabda65…

MALICIOUS

PDF

78.8 KB Created: 2021-09-11 08:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f6c76b7adb43a1404893df9d384822b SHA-1: e24b4f4b3b8335e720c77973992f597b228ae956 SHA-256: 892d5c185fabda650a3fe0f7d94b2745baeedb3c7c21d8fad8084de58bb6c70d
174 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The presence of a 'Browser Install Lure' heuristic and a 'Download Button' suggests a social engineering tactic to prompt the user to install malicious software or extensions. Numerous external URLs were extracted, likely serving as download sources or redirection points for the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+make+obb+file PDF link annotation
    • http://banquat.com/userfiles/files/wizuselekaved.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/14787780305.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/56306460998.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab59b66a4---sibosatisejazekizorofuvut.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxufuvamaxu.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/ziziropagiwakopewet.pdfIn PDF document text
    • http://gr-chem.com/upload/files/43922709651.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffe8ec81f---rowewimamolupagizevun.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagojoxebobazakosokoset.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/bomalemuwofiwilajupadid.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/36449951569.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/padilorajuxujoriv.pdfIn PDF document text
    • http://exima.kr/userData/board/file/busivodenobu.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/34422682580.pdfIn PDF document text
    • http://mlead.net/images/e/file/vodixetorodepiweka.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/55067086960.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210902_DF7EF3136AE2A6BC.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/62871138074.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_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 10312 bytes
SHA-256: 186eaaadbf3f103eb4e11f1e3ba843d3eb1ad7e4eb8f5d8ef85b9168a6325eb6
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 17524 bytes
SHA-256: 9900191b8c36c716f82da0c520f866e3fc7b1f2440aea6d9aa60e41f070473e7

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