Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e8ea1eb21aad99…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 22:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 171edc2ca880378bb71668843ee9523c SHA-1: 7b528aef7be88887bc49a754ee0fc9c14a3528f8 SHA-256: 42e8ea1eb21aad993b8f2a32d51e2fdb86b6d52af12da11b8efcbb23a09a7087
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 external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=moto+g5+os PDF link annotation
    • https://giorgiosantinelli.it/file/17918854443.pdfIn PDF document text
    • https://bem-sa.com/img/file/mupekadunutif.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafa431dbc---vefez.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/refakafaxudupep.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/72656900857.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/golabuxas.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tunolaxak.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/zifejigawijami.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/14712871096.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/25131705433.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/64009108494.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/wusomuxezoxotunewi.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/13350898000.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/46207982467.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/48862891385.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/walikogegizemovewuna.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/sukubomelotojije.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/pevob.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20794321983.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/puruxadejusepewox.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/14364529341.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/gikibisi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/358741650.pdfIn PDF document text
    • 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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 18224 bytes
SHA-256: 2925405573a3c81de28d97bf40223e0987d300375f9f8f0cb7e64bcefad064ad
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 9776 bytes
SHA-256: 9167e5c3e760f6583bb663130894f90987d256563e635cdbc348442358edd852

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