Malicious PDF — malware analysis report

Static analysis result for SHA-256 a977664672624f87…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 08:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fc184f4090d0d1254301f20823bdb30 SHA-1: 04d1c441026708c64bd259b4aef3d5d98cdc618c SHA-256: a977664672624f879a4695caac6fccc4ef6dca8eac90319246a7faa6afde7c10
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the nature of the file as a potential attachment suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://cupanghitam.com/contents/files/11635258123.pdf In PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46997224324.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/13591018641.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/gudanojon.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ulvvarr6tbi6s7ck7ouui0gmj1/zevezemaxinefujavikusekez.pdfIn PDF document text
    • https://emmaushuis.org/pages/61413344004.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/66983689793.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/fajofelavuvasidako.pdfIn PDF document text
    • http://elsped.hu/files/file/76284954150.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/kevapaluzadelodom.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/nobowopopepiwidizafafet.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/regoxatelikexa.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/76985256705.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/35382029798.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/jexabixarukir.pdfIn PDF document text
    • http://fxlcd.com/upload/file/45833150346.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/sutux.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kawogefopigudunave.pdfIn PDF document text
    • https://anandalaya.in/resources/file/85723419246.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gaxizekijoragor.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/gejuvexax.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/30691738063.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/45274315316.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/razukaxesoniwivemod.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b4df2fbfba9720f577cec6e1e988f4f6/30536397861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=words+starting+with+e+and+ending+with+yPDF 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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 10676 bytes
SHA-256: 47d26f1facc8f1174038092dbd56797f472679ff69243d568153721aef08c5ae
font_01_sfnt_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 18460 bytes
SHA-256: fd582a7d7a73f5a095ef53b93d0ace1d53cd1921ab64f19b0c9102db6d86e919