Malicious PDF — malware analysis report

Static analysis result for SHA-256 85357b800b3b74c2…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 00:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 40f43e03025df005b8e496c2eeb4d4ed SHA-1: 30b206e20bc7b48af547f8170c0eb94f0ad1b182 SHA-256: 85357b800b3b74c2e3db521d17e17e57d9d208cb19e6b018aefd47ca047dffb3
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The presence of external URIs and a high number of distinct hosts further supports this. No scripts were extracted, but the overall structure and URL distribution point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://abnigakgdsg.friendship-match.com/upload/files/jojitenixuso.pdf In PDF document text
    • http://www.koeru.eu/failid/file/lexev.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/29271252943.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/xixemokepalumekilovinu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/68588640912.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/85590119035.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/85723777211.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/temabiselanasufaj.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/94465409816.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/60355925854.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/91550730485.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gavotafazonojemelo.pdfIn PDF document text
    • https://aneri12.eu/res/file/giwes.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/jk2auinmcfk3qq01co35rkkg83/xefidemimura.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/sijuzene.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/63325051937.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/78530676885.pdfIn PDF document text
    • http://kes.org/upload/editor/files/jufisavaxosubeg.pdfIn PDF document text
    • https://artenika.pl/fck/file/25117302897.pdfIn PDF document text
    • https://titishop.co/upload/files/rabak.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/dotudukufizezupolejisotix.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/nuluxa.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/defosagajulusewilebo.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/taporejixo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161458dec38719---83612240102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+wasteland+critical+analysis+pdfPDF 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_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 17760 bytes
SHA-256: d359c764638b0af27b8530ab5348353709d308043d09bc6fb3d7d2943f2b45b8
font_01_sfnt_off00012554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6B 10760 bytes
SHA-256: 86080fc41b79c9684dd76622dff8c4719eb63b15c2fd8667d9cce6e56dd7dca2