Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfbd5e35abf1209…

MALICIOUS

PDF

75.3 KB Created: 2021-09-30 19:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5fc0808024aa85c36c7a499797c5b2b2 SHA-1: 15e0130c26343df9a10b121e7a10eb2227f68ce7 SHA-256: ddfbd5e35abf1209ffe188db96f4b838022c713c18f5cc86eb1212c45c73236a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cameradungphat.com/uploads/files/49348979748.pdf In PDF document text
    • http://re-media.ru/foto/ck/files/49167081513.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dexofogamoxuxemezu.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/49062735098.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/nogipojarafexulowogevo.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210927_DA09C44FF16970CA.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/54775174531.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/vesizokoxetufomagojeg.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihks9ij79sqt04qphioiafdb96/javabotom.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/56853586339.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/32215624166.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/sategurogagimuferaza.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/15890585619.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/40350883600.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/71081025440.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/1534128673.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/42912042506.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/81621725720.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/67163993266.pdfIn PDF document text
    • http://wamer.org/userfiles/file/19252148106.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/kixodemobumazave.pdfIn PDF document text
    • http://aromata.ru/upload/files/nodubemezirerir.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/wezezebagajexikikoneroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=como+descargar+aplicaciones+de+google+play+para+pcPDF 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_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 18260 bytes
SHA-256: 310fe91c65eaf202fafe5fcdd5a9a0d188e133d3e4c5ac7e868192666a14511e
font_01_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10904 bytes
SHA-256: 19273be2fb3fc2f2ed005f0caaf44db10f588aaf6b7791c3ca078a7873bf40a9

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