Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d6092c480b66e2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 20:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 915f3361302a4ee07abfb4f2af0c9b15 SHA-1: 43bc31d89815bd95eebce1d8b9dcb2ca4924c939 SHA-256: d6d6092c480b66e22634b6130baf962d436646f554bc50ff6e3a37226018d14f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to obscure malicious destinations. The embedded URLs point to various PDF files hosted on potentially disposable domains, reinforcing the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://beldapin.com/calisma2/files/uploads/21458880270.pdf In PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/katejagofevonozusulux.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/xarejinogur.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/63399390313.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/luwafoligadeku.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/giguwuvodigerule.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46325193125.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/90810411567.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/16499925459.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/ponubam.pdfIn PDF document text
    • http://www.andreapondika.cz/file/41239019658.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/sabuvanupujuruna.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/25729611136.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/31512652311.pdfIn PDF document text
    • http://teraval.cz/res/file/duwijajolenipezunebotun.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/nefapozopujivam.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gijori.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/17140101492.pdfIn PDF document text
    • https://afma.pt/site/upload/file/zawenujuzegurejafikujufup.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/17718653606.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/nuzarilarapoxelidasem.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/81403759102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=recycle+bin+for+text+messages+androidPDF 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_off0000ae09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE09 15272 bytes
SHA-256: b971104cf5387367c86f6734d8e4ff008fb9fe7c673252d3c3f966356f091bf0
font_01_sfnt_off0000d469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC80 11220 bytes
SHA-256: 57e71b209bc56b89e394e900855c7aaa530779709a84e4fd30912a27b3832605

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