Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1e44902fa955df…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 19:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e9f29560809ac0c0ec70c01289dda63 SHA-1: 1563fbbcb33a08c2f9db66a6abab85ce27f916ee SHA-256: ca1e44902fa955df5a1baf288ab0dcff59c414ba021a95ec7963d275b449cf85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of many external URIs strongly suggests a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=udacity+android+basics+user+input PDF link annotation
    • http://anaminfo.com/attachfile/file/61508240912.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/2317196163.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ec898c9abc3ff63dfadf0eaf8c6ecbfd/346415617.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/mutezetivejatujetamalebu.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210911_EB73B2491D0A3947.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/36231676055.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/81659796084.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/rogojutaxilazuron.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dixasonugabuvovodetug.pdfIn PDF document text
    • https://andana.us/files/files/45620468425.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/83949226792.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/4289499605.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/ninegorifosines.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/50677433476.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/xudemafisotipufagerula.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/rajezujobopibi.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210901file///39281214816.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/22761806712.pdfIn PDF document text
    • http://regiapart.si/uporabnik/file/xapuxavuvafanefomokanujan.pdfIn PDF document text
    • http://brenderup.ro/mm/file/kafoxoreweritaxo.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_off0000d27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27B 17648 bytes
SHA-256: 7aa27a4b009f5e3af5c7e347ab9761fecd22dbfedc92fcf7b80eb32f3f760fa2
font_01_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10820 bytes
SHA-256: 35e798f935d56c3aeeee51ab250abd46cb46393dae8e31e83ad95a9cd486b8ef

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