Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dba854586842cc2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 06:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3196570856b74955dce6554901eb684 SHA-1: e053e4ae8a6ab71fb5242a35ed4dfb9a2bbcf8d4 SHA-256: 8dba854586842cc29e728b7f79c977b8fa3c7c29207492048ea3469dbceda8ad
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload via the embedded links or a visual download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://pixomot.ru/uplcv?utm_term=diskdigger+apk+download+free PDF link annotation
    • https://psfund.org/public/uploads/files/cms_files/81166207400.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/jubiberedifem.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/31467972513.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/38572737624.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/5238179351.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/915dfe2c968b3f94b0f992257cb9b1f8/98385101106.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/79606383442.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/86044147447.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c0f64cbbd---ketijudodagepafuserefumu.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/lipoxexokinovaru.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/47218640601.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/10198214085.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/kevarebujawuzep.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/19763258572.pdfIn PDF document text
    • https://lesura.net/userfiles/file/85059049742.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/28722051996.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/nibusutid.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/30166677339.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sazaxuvi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/98209352989.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/57640066992.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_off0000d1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B2 18584 bytes
SHA-256: ed7e5c9858992b08f7ef6dfd117691e54959aa5210eb38894b03a12916935c20
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 10752 bytes
SHA-256: 571000127616b467f1335c64b59537b9f6e40cfc952dfa076d4bf13fc8c14f3d
font_02_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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