Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1a5c7b2b2e561e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 05:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 739e3d2797495c693da50aaa4800762f SHA-1: 1e6b6f85501cfe3554c728149b4224a92a77583d SHA-256: bb1a5c7b2b2e561ec8b5a0ec2f443c6c2ebc6d94b76332aa9127230348934c9c
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a social engineering lure, specifically prompting the user to install a browser extension or update. This is strongly indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document also contains numerous external URIs and links to potentially compromised websites, suggesting an attempt to redirect the user to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://krisoc.ru/uplcv?utm_term=does+chromebook+use+android+apps PDF link annotation
    • http://kammed.com/userfiles/file/4750183847.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/bizufanosas.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/49666525815.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/buvolimiwatofofowa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426ef027441---fevozefogepapujas.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/61897070.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fefakabojesagutezapob.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/61478040583.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/vesekezagodatogobetazowu.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/pevevaromomezesusitug.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/39315670969.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f7089a1a---16736570021.pdfIn PDF document text
    • http://w-mill.jp/images/file/57683170318.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/jomubuzalo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7b8561a17fc35da78f4287037b60b5f0/76279307965.pdfIn PDF document text
    • https://dom-titan.rs/files/lanubuwof.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf12ee16c---wiwatudo.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/zusikexakixivewave.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/kavojaxekeri.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/jibafufamizodalaz.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/dukozobelivutek.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/77464850924.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/natutikodiwiwovadokifixam.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/16436172184.pdfIn PDF document text
    • https://citytrafik.nu/images/file/92016687613.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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 10968 bytes
SHA-256: ee259472af44d8704bfb810250d4e226373cb9ec149232c83972d4588a024b33
font_01_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 17572 bytes
SHA-256: 5bc9086f8d16c0185d6c8df6a384e638a854d2e590c60421ed16a297a5f94ee1
font_02_sfnt_off000138e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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