Malicious PDF — malware analysis report

Static analysis result for SHA-256 b459ec61c3ee2888…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c062e561cbc39a1e67d9f825bdd62a58 SHA-1: f107c0d77ae760d59402c1f68ec009dd01d898af SHA-256: b459ec61c3ee2888322f655c1285cc7594a6daa583c3b1aed72d9a8a8d888ae1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains hosting PDF files. 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://decom.pro/admin/ckfinder/userfiles/files/wakuvuworaxepena.pdf In PDF document text
    • http://infracsap.hu/files/file/50773811702.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/88359754819.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/pebefelikivilemupab.pdfIn PDF document text
    • http://myphamasia.net/upload/files/9705420423.pdfIn PDF document text
    • https://cmoretv.com/userfiles/98265416223.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kavexuvixesigizubajololi.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/lejaperuxidaliveguguso.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146112e2cfe6---94112097704.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zosajufemi.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/db485b82b129604be1805f0e9547fef7/81183470415.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/tofoti.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kevironeginomamapijule.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/80923382826.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/65397555253.pdfIn PDF document text
    • https://birudongker.com/contents/files/16402849652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+call+as+a+private+number+on+androidPDF 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_off0000ab94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB94 17220 bytes
SHA-256: bc760fdf78883bb00ef144ca9744fc76edc6ebf56ec4b7981236e593c966ec4a
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 11060 bytes
SHA-256: b34e5b54bce368517d29c10991c007ba73f3252d9c94f74c42505560a1f43269
font_02_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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