Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8a6a24897a7756…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 11:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 373197f77007b77edab879551c75f37a SHA-1: edef80b622292f9894b21e262729193adbfc0cfb SHA-256: ab8a6a24897a7756b3e139ce9dee8e0e11aef4f9a21998adadc877d19d533b6e
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7cd2268---10014295615.pdf In PDF document text
    • http://newo.ru/files/files/33552317886.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/16799994757.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/87602526021.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/julomane.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/kufunaduveso.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/70999789582.pdfIn PDF document text
    • https://subarini.ro/mm/file/vivikupelilelub.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146ebe119a32---73046740829.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/80420715962.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/javolugomerivisijotudened.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/zisumufavepitataledos.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/48734863549.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/nidipen.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/gigujup.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/14684631415.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/10202450481.pdfIn PDF document text
    • https://campermagazine.tv/public/file/8449980195.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/tiwikebusex.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/70553887616.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/sobefevo.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/87272528393.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/2246012095.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawujuki.pdfIn PDF document text
    • http://agama-rc.com/upload/files/64305649612.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/53305176855.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210916_69D3FB945F7E8F2E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=vinveli+9000+kmphPDF 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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 10288 bytes
SHA-256: 3a92d13521148f672e831edae399e5500432014d62abf8dfc744938a9322347a
font_01_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 17836 bytes
SHA-256: 5162dd8d1ae2ee0c808522950513f9b31e4bd81727bacb726fe7dacb9e381ed2
font_02_sfnt_off00012aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1