Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafef42245cb206c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 12:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea791be96b0958168e6eff5c68322925 SHA-1: 18ec21fb2586d13655f611cea67e58577ec55163 SHA-256: eafef42245cb206c4fbd06f098bc9f59438a9be96f2a16a211f909c855776987
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://truhlarstvi-strakonice.cz/files/file/jifonamajum.pdf In PDF document text
    • http://laskod.hu/userfiles/file/73263673739.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/65435040654.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fujufabem.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/perixazom.pdfIn PDF document text
    • https://almavilag.hu/files/files/77047770095.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/43990863305.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/xogededeketej.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/79851894895.pdfIn PDF document text
    • https://titishop.co/upload/files/73879960317.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/97422205646.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/qg84nu0jjd0of4u3j33msfeec4/mezufukor.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630776263kosoferemidex.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/sopabebeximazajiwakejemez.pdfIn PDF document text
    • http://hkacca.com/userfiles/purobijelum.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/49294782443.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/zinusilekudewilemi.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/domuvudebonadopixexi.pdfIn PDF document text
    • https://istanajp.net/contents/files/58237495809.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/sibuwisevorasogafilovaja.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/51078394880.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/potukusajarofanid.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8dfbdb91---53617014035.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/82767825839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=game+android+gamepadPDF 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_off0000ec33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC33 16752 bytes
SHA-256: 4af87395be0af4e116b71f52ac6739c6375b17824398b718552d595378c664bd
font_01_sfnt_off00011761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 10460 bytes
SHA-256: 7f0f0d68b2dd11a3fa7b00ed9fac350cfff2474bab746d1457d53e48b91b318d