Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1188803980390b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 12:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bcac07cec2e52afb1e93dd2aeea692c SHA-1: 50636b03b1a7686d4dc14a330934877da743f7bc SHA-256: 9c1188803980390bb370c8a7a206bdb14bc5a234e7f1aeacc9b754ef46a71802
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious external content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://www.poliklinika-hb.cz/userfiles/file/30789899849.pdf In PDF document text
    • http://rund-sro.cz/UserFiles/File/3859854116.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/27167140549.pdfIn PDF document text
    • https://retta-bg.com/userfiles/xasabixibosedo.pdfIn PDF document text
    • http://pinxedien.net/upload/files/woxaleluraxawesu.pdfIn PDF document text
    • http://vizcsap.hu/files/file/nizuvojenigutefotovazu.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/15721861288.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kigimaranadedalejegowa.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/lotux.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/42391852732.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210914141029.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/jofusosuf.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/puruzurazobus.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d22b5437---79864579374.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/52487478844.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/kuritita.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d56f0645---8424364995.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58697521195.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/tizapisonopixisup.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/82303796242.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/54399942185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rakuten+on+firestickPDF 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_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 10520 bytes
SHA-256: 7a61f8717e5e82ae3d1a63efd838579268cbea551f078c9c26de5f49a8d585ec
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 17848 bytes
SHA-256: 2a62bbd1f7e5a39662df3113fcf5cccd9ebe7579856bf992b0342055e920a751
font_02_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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