Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c3b3171077c7ef…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 21:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b90a28f92c7e6d5cd362bf539b528ae SHA-1: 74ab5dafe4644f24d85dbcfe8432388a09db2cbd SHA-256: 17c3b3171077c7efd55067dc125649c0e8b37486083159340eb71377d9b87f4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=shadow+fight+max+level PDF link annotation
    • http://el-system.jp/uploads/2012/files/91812307115.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/tunirumap.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/55266667843.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/60269008254.pdfIn PDF document text
    • http://zae.me/datafiles/file/31347920283.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/95896479024.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/1936966198.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/12610816175.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011524368470.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/duvavipasaligifegoporivib.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041532398256.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/liserufikunej.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/xizegubopalopixukepive.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/daguxogofomarul.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/1445940209.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bikexejikikaliganofefowin.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/57085138061.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/27298038215.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/24651984098.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/88030686288.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/nojibo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c50e204c9---86048550354.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/sudalumuluzulefofus.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/favututosujesifati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 10756 bytes
SHA-256: 33cc1f0e8cdde70373aeebd6ced8aae55bfc5d0b498612293a029d5bc1451b26
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 17240 bytes
SHA-256: 89fd1e41bdc40314853bf19d777361297aac676472d0d01d89d8585c98d9d2a6
font_02_sfnt_off00011ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1