Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbfcc48a3af6e4e…

MALICIOUS

PDF

73.9 KB Created: 2021-10-08 09:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 116dfa1c8c4f789a51917f8e687c1c54 SHA-1: 2e310ae962c00ee179e217e3a3f1c09afaf2be19 SHA-256: edbfcc48a3af6e4ea81f0cd7f63d4f17e95abb9d460052cd5bbd2ce910b8b823
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kbinteriery.cz/userfiles/file/zawenofasopakabizitow.pdf In PDF document text
    • http://galluccifaibano.it/userfiles/file/jekimebexepuwe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///53319335274.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/84654605272.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rijotewinumun.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/19669869840.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/josizabez.pdfIn PDF document text
    • http://nanjing.chinatupai.com/web/js/ckfinder/userfiles/files/55499389134.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/wipodazutolobif.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/raxirodavafipedo.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/25699399028.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/31839490836.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/75546480757.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/80317301827.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161569e45a4a6f---29287576388.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/zikokinevadi.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/79817837363.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/wosaxaxiwaxaxisufuvi.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ea46e40be62935a939ed930182f5d8c2/34716890174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=histogram+processing+in+image+processingPDF link annotation
    • https://forum-auto.ru/data/files/In 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_off0000bbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 17680 bytes
SHA-256: 7025a774a4c095f5e419a3a7f79399e322fb7931594dc21d16e579211ac98fdb
font_02_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10660 bytes
SHA-256: 41b7de54bfa289aa52d43a575aed5bed88a91bdc47161186dc2ae2bf99ba84e6

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