Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1a0e8aacdbf4ff…

MALICIOUS

PDF

79.9 KB Created: 2021-09-21 17:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7d1ed7f5ae98761def53099bb3c0e08 SHA-1: e518e689aa6642ad2b49309eea944dee7358a64f SHA-256: 3a1a0e8aacdbf4ff57bf558df95da064da3043d8e69e5e34a0aaebbfd66ffb83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://www.naturhalles.fr/fckeditor/userfiles/file/30482094077.pdf In PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nerevuvixu.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/bipapibirexi.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/43020429809.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/37584550400.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/11/21980343990.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/26662165300.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/34734934222.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/geluwawemozorededulu.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/rugitevifogojanataga.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/29670682653.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/zopupoziberol.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3d033d222823a8206af820b3b67d83b0/jokemadinebi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/sagakedaxopisi.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xerijuzegevete.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/49618576285.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fupoviluguvezadot.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/37362004680.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402b2e5ff08---99961865598.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/remozoxunemuzesonegimavo.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/54305677751.pdfIn PDF document text
    • https://wittnebel.dk/file/jidunexiparabojepapij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=surname+first+name+middle+namePDF 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_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 10568 bytes
SHA-256: 6e53c7b23dfb4e589ce7ff722470029388afa8815092e3fc6d89550ab53b52dd
font_02_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 18300 bytes
SHA-256: 29cf91f83c20b339159479aa0eaf4584320c7ec0e4f702c5e082a1d860b55332