Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a49bdeac3a08d68…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 10:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0e170030d948ab8c24bdec15188c7895 SHA-1: 9d77a639d5769fef3ab050cadd1592d4210d659b SHA-256: 4a49bdeac3a08d6894ff2bd6d86d1d036d2d5d6421c2592b7fc4852438dc86a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one specifically pointing to a URL containing 'notepad+pro+mod+apk', suggesting a lure for potentially unwanted software or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign or to download further payloads.

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://allytemp.ru/uplcv?utm_term=notepad+pro+mod+apk PDF link annotation
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/bewiziloxejuke.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/tefave.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/pegadowedi.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vuwupigewojuzijiz.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/26764069585.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/rolederixofikanixola.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/29500526525.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/95619065833.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/36224284474.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/2956227159.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86940399551.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/pirak.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/88556180181.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_890AEA3B522335A8.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/37270691371.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/ridatajubewi.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/ligivolofusudadiligulu.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/71405632366.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/55418059059.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/pepulexe.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/8185547753.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/7954979107.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/xabudetopuwapilakekure.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 10212 bytes
SHA-256: 9e84cd9faf7128ea470161ab1f8772447423becfa471a98fee4e770c419320bc
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 17676 bytes
SHA-256: 45f7c7a28b37f4e80c17d5aece52cdf4caa42a21222b454cc1ee605796cccf36
font_02_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1