Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8e7ed2ad1a19d3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 19:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07958f748e06330f770b6ffd2bf9e0a6 SHA-1: 298a4915d08779c1c1ae936b54c7f0ba169ff56d SHA-256: ab8e7ed2ad1a19d3e85d905da79f6947acac0e9733d63d7da51c9a5636763d16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. This indicates a likely phishing or malware distribution attempt, where the document serves as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=what+happens+if+i+reboot+my+android+phone PDF link annotation
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/77333308842.pdfIn PDF document text
    • http://parateam.cz/file/zabakugoboneromukute.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/56807587713.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/85792988743.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/03/85078442724.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/mezevuvofimufutusazuko.pdfIn PDF document text
    • http://evola.it/userfiles/files/60959689516.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/15007850042.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/3953814771.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d3f9eb3cd---gofumatuxukevatuz.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/60875075005.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/tugep.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/84708926852.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161391963431aa---10903894941.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/buvovave.pdfIn PDF document text
    • http://annabarons.lv/files/files/gatup.pdfIn PDF document text
    • https://panoramabyty.cz/content/radetip.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/67236462381.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/27390011240.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/70014003623.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/24273508803.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/18399864830.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10964 bytes
SHA-256: e401e911bad9d6a2d8ca5439d45519d16f96f3eb26ea16db1d9465361f6e98d8
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 18192 bytes
SHA-256: 4f8c7534cf87fa730cddd1efa21cc090acc30a1b8af3a908230f51a01020c647

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