Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c87bca8700e3e…

MALICIOUS

PDF

94.3 KB Created: 2021-09-10 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 2a6fa9e283c070a7cbdd37dbcb9e5b58 SHA-1: e163e8c0f0aa1fb0d3643e92a22761b5f091017b SHA-256: 856c87bca8700e3e9ae903fe0fd242673c318c29ec22b6fe436038c88c102811
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pixomot.ru/uplcv?utm_term=earth+and+legend+play+store PDF link annotation
    • http://jagdrevier.hu/upload/images/file/90880879318.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/sixotekilemuratadebej.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e09877d34858db342373b8eea55fa1d9/20737884553.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/64676662629.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/befafolosuvejogidokakabud.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/mevozerexodarazofovadif.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210904_12501F686FD333F0.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/saxezokebupubavutomuba.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/62271813527.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/79136164082.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/tefugojiwab.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/vepute.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210909_143441.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/37304923671.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210906180701.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138970856688---23064066497.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/mivosasatijegupepizaxu.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202192226157722.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/66889368687.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/26915203827.pdfIn PDF document text
    • https://produse-zilan.ro/files/40658734016.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/visadudul.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/sakadekomuxew.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/megerogulul.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 23684 bytes
SHA-256: 7ef343305087b688a79b872bf8b2b8f84a350505aab011f40e26f1215dd252a7
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16380 bytes
SHA-256: 4f2409aa88bf6b583f4c224dcbf42814dd3cebad97f75ea1cff0e3a51ef31032
font_03_sfnt_off00013a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001528e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528E 10676 bytes
SHA-256: f689774af54ed15784b7ac3e0054180f4e16a529abe906752b1ae68d20414b28