Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1e6c8f51e2bf80…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 779989b276d2ec2a9df25f63ae864394 SHA-1: b04bf073edf2d40c9f88f424592951d1befdf0cb SHA-256: 9d1e6c8f51e2bf807deb462c09e8669ca6f2b7ba931eab54f283e492ed29d75a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest the document is designed to redirect users to various potentially malicious or phishing websites. No scripts were extracted, but the presence of numerous external URIs points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=android+sdk+demos PDF link annotation
    • https://rumahbaruku.com/contents/files/tojavow.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/bofes.pdfIn PDF document text
    • https://domilot.com/uploader/files/82667234629.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/samasumadofili.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/20e3b55359288a653363599a1b2219c5/kudowosuzod.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/zabine.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vurexezisa.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/bewivenebu.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/dedowezidikulazilowe.pdfIn PDF document text
    • http://ativn.com/upload/file/gopetenekokur.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/10868287619.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/81004380754.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/jixugezep.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/92458571994.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/vitekiwilonivoje.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/gepojukuxelo.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/52024372871.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/logusufex.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/21099765720.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xebami.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b69b2e8926---daxixeje.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/ramofidexabojutiti.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_off0000ad86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 10176 bytes
SHA-256: 25eea01ebcd4c306d9c9ce5459d351f164626318f6b7097b7cae0dabe90d05cd
font_02_sfnt_off0000dc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC58 18920 bytes
SHA-256: fabe9315909c326224bc62299f90619bd882093bd6d38256fbc7cba047e1ca49

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