Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e35279a107ef2d9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-12 22:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed3dbb7dcaed16f289b45d02c8e6455a SHA-1: 9a7990579a903d13f6d72dcec814110029cc4738 SHA-256: 3e35279a107ef2d93ac81b13199119d3f9ce400e303f410c471918b15eed0184
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs point to various domains, many of which host PDF files, suggesting a coordinated effort to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the high number of distinct hosts further support the link farm and potential phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://karlholmbygg.se/UserFiles/files/62445190284.pdf In PDF document text
    • http://consorzio-csa.it/userfiles/files/zegemizavefumuwuf.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/wekadomabifopezekifudiwe.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/guxijizedeluzabowitise.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/42623804750.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9740726041.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/rexagusut.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/78624660986.pdfIn PDF document text
    • https://maria-galland.ru/files/file/wajuwosowifuke.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/28245951230.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/13767375039.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/78022389818.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1eeb8d8d---rulofuluwazefemifebaxuso.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57031814042.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/fejivavet.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/68498683282.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/6500481597.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210901165901.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/sexuromagerovu.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/40196790572.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kidirejebajabuvarosa.pdfIn PDF document text
    • http://receptlap.hu/files/diwunaj.pdfIn PDF document text
    • http://storemisr.com/uploads/files/35075702401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=5+letter+fruit+starting+with+pPDF 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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 17864 bytes
SHA-256: 90ef9afdeb24152f175e0c36f6ab0c3cc178cc2c16cfb22ad8c901651188f0bf
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 10740 bytes
SHA-256: e6f1d119975324a24e8fdc08f0e1f7b2e7ba553e1dc1ce4a3c017db36342e358

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