Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc2dd477e976a8b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 02:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2056f1a2fba00ca647d1ab458355f692 SHA-1: 451dcf2a5cefd6546a89296a982fef5b5b88ab7a SHA-256: 9dc2dd477e976a8b0de4dcc4be889739f603287bf0e3739d73add6bd1d525961
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many external links strongly indicates a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dnepropress.net/files/file/tedip.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911030139200408.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/98821216737.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/tupopesopevutefiko.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/pevavomo.pdfIn PDF document text
    • http://djapm.com/userfiles/file/17387286595.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bc0adb91e---seweferijalesokafoz.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/fofixedomam.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/7764474524.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/15776151845.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tejatugajiguwewibij.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/70952272420.pdfIn PDF document text
    • https://finliz.lt/i/File/25674630309.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/tateri.pdfIn PDF document text
    • http://freeski.hu/freeski/file/jemazepij.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/gamupaletalixilujowon.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/80698452195.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/41663453062.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/47576823354.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tosuzadibogegedoxefameb.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/29425831636.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/foxavojid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=proximity+sensor+test+codePDF 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_off0000d1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 18168 bytes
SHA-256: 609006ba4bccc307deb40c74a28f380c3889a6a211d75fffce93d0ff139c7ed2
font_02_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 10540 bytes
SHA-256: bdf8c9e1a36263ab59c8e1211de92787e1bda830b4591deb2f23d7c21dc21300

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