Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18641ca711b3a94…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 15:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 999673b6ff793cb23745a576d799ce06 SHA-1: 68cbde088a362a19967331bf31c74d50f3779728 SHA-256: a18641ca711b3a94ca9b57688686e3fdfba3b74b650fbb68a9ea67336c75d7a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external sites.

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://yodobashi-church.com/fifawovisop.pdf In PDF document text
    • http://mvdeastudio.it/userfiles/files/xejubegofez.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/69269428479.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/55044160615.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/14481910866.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910130433.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/11089981954.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/95556737383.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/nurezurizo.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rolef.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/16425402749.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a775b58a9c---vetabakadi.pdfIn PDF document text
    • http://tchid.net/userfiles/file/bebowamijamujekopirudep.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/riginumiroletefafibadad.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/vurufufavi.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090208465251.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/vuwinaxiwe.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kanagerovezazanodegixunuf.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/24478080421.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/87932644856.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/41405522513.pdfIn PDF document text
    • https://fond.ru/userfiles/file/58647328548.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/kiwunadimifeviba.pdfIn PDF document text
    • http://1careglobal.com/upload/files/tixarafukeduzomakotaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=joe+rogan+debunks+game+changersPDF 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_off0000bcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDF 10904 bytes
SHA-256: 41843a5923e33bff7afc4359e2844d7580aa7aee0a952c47a853c3c59ee88e2b
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16596 bytes
SHA-256: 4027678e2cc280d9ac7a5bba3c4208c7240f2bed68e1ddeb06ee68417082be35