Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4fd5f2d16b9174…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 04:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 42d0d9912eb9b5f4b0abdbb153c7c877 SHA-1: 1e8d5257af7932a69ff545f86e0832b360bc9a8e SHA-256: ae4fd5f2d16b9174e36931b9049ca4f280f9564a0e8db766eddc175237ce3c5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the numerous unknown URLs extracted. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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://autosoftware.company/autoresponders_images/files/titogewipijisulojubupup.pdf In PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/56055639548.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/xatazuxazodaposunonajazek.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/661332792.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/68048801514.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/xitawalixugupedesog.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/vitawos.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/morobilefimexavatol.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/47571924661.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/55466600450.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_536010CAD699069F.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/69778267233.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/lokowopokavesaru.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/jexasubabalajenekejal.pdfIn PDF document text
    • http://dialogueinpraxis.net/files/docs/loxagakamemi.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/59834234799.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/82581547610.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/sunumetalono.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/35811489720.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/89036870640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=app+sara+apk+downloadPDF 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_off0000adab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAB 15948 bytes
SHA-256: dc825287a6f396b700b0c530d689cdac3445a971e1206910f88bfaac494a7830
font_01_sfnt_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10220 bytes
SHA-256: 1e71d5639b62caf22c542652b0e2ef508b66a5444f7e0a3a9bb7a94e7bdc3b5d

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