Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5ba9f303189178…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: facb65bfbd5b34895238a92d4d874024 SHA-1: e0c64db3c5674c122f6b3a110551bfa4d17058cd SHA-256: 0c5ba9f3031891788ebfeada37a6b2517afe3a6d0a7bb2a6ba26e01606112f0c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nakajima-ya.com/upload/save_image/files/nilemeretevunixor.pdf In PDF document text
    • http://tysons-cafe.com/uploads/files/29381442866.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/80412305571.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657781c6f4---49419573470.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/15670484741.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/9988406386.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/morawi.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/kodaxa.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/demupatigibon.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/mumapubamosabebekase.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/98912211078.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/20012848718.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/negotovuruxewojizaraduxo.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/86944869510.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/48758544810.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1bb93f66---demakugekadojekawux.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/guganava.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210909_2121B3552E487D09.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/23088796663.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/waromudetataridesewozamu.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xijonuwukegigavikixasa.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/95959525885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=app+android+accessibility+suitePDF 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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 17260 bytes
SHA-256: 287ee066b6bf7244ee8b3244c36d8ffb20b1aae04f5d155ffba8d8d009331f88
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 10844 bytes
SHA-256: 20a5170abbb54b6e99a5b10f9518bbbce41033a8af4626842a57130f78d5a932

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