Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3a945b2a9d0a77…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 20:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 799629555d4623c1f3364dc3397bab96 SHA-1: debde7b1433306adb5862bb4f43ce7619d380114 SHA-256: 8f3a945b2a9d0a77684a5e5f5d2c1e6a39a2236bd9520c067b34c2073e34f4f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to unknown domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://kermanrooz.com/img/files/nibuwubobawere.pdf In PDF document text
    • http://serextion2006.com/js/upload/files/82319192713.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/woneleveluketuguvebopepis.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/zumirasefopilawozivil.pdfIn PDF document text
    • http://sunway.me/uploads/file/180553379866.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/74655122695.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/49376310541.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210912/files/20210912224601.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vabonuvenatabe.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/dusuluxazobut.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/39640582658.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/47968088.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/zujotavubu.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/derajusujukidazuxaxives.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/bedutaw.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/62052727818.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/31009291742.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/vavolafokuradoberegewon.pdfIn PDF document text
    • http://orthopediedelft.eu/files/22188030550.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210905200426.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fface065410c971d444f11d32b7aeab9/38944193746.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/pakobodumajejexoxozonon.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/bamilobupevalegovevilum.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/vosudirenerifabaxazokiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=every+star+wars+skin+in+fortnitePDF 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_off0000b051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 16984 bytes
SHA-256: 7c9b88b9ed01e2dc5335285c25ae6244133fa7e66e2cf35f2cdf8703c523da5f
font_02_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10504 bytes
SHA-256: 41aa8e220cec1c4b69a312b88d57d0aae6783a01a54947478e66c2c4df3d06de

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