Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083f378c2d0c8e6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-11 01:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50f3c50d58e3bef17a84f3b858720324 SHA-1: 412f5f7b3a54041350d0c0a994aae334c635b3b1 SHA-256: 1083f378c2d0c8e65f48cb53687feeaddb092a28d058db584126d05a83711e1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, and the presence of external URIs further supports this. The file's structure and content are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ppuhperspektywa.pl/files/edytor/file/54407086502.pdf In PDF document text
    • http://kd-council.com/upfile/files/63506471266.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/pekokojiwulokedud.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/26318471579.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/worexatofizizeliwuzudab.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/tisuwud.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/romesexuboxemura.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/25431307094.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/44005807275.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/segevamozobepamutesegukin.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/jajejumujadez.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xisud.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2561011922.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/27932895641.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132133d0bc6b---fozafawudafa.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/vekux.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/xoxemutawituxilazi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/defemowikegefa.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/63675330026.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rurodujufifefo.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nakolozi.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/fulowolirovuji.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/96923090071.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/17329496408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pocket+god+journey+to+uranus+apkPDF 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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10988 bytes
SHA-256: 76b0b40b202005072eb7dc8a16d04eac2cbec1a072d5455674277d03bf924e94
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 18460 bytes
SHA-256: 5cc9b805df7213b5e1dc6951ab44662b111020e8607ee3a0dcc0345fa5ab0e09
font_02_sfnt_off000136d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1