Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a36ca3da69cb993…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 00:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff482930be0b5a5aa23ab0f3d3eccae5 SHA-1: 090f3921f13292eee5ca8fc6e079334f5fa5127f SHA-256: 4a36ca3da69cb993a37e6e708c1fc5ee96ae7bb5c4b75cc81e3ebddb6914b2b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mentor-tutor.com/newGroserLikeProject/uploads/files/57780826217.pdf In PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/86396342182.pdfIn PDF document text
    • http://feminella.ro/upload/fck/3339700055.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/rujukazikuvojofulowu.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210902_0A80861117A00A7D.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/86085999153.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210903_941E959969E46156.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/kewakurajezotekukivodud.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/4812351111.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/27021769402.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/83010261416.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/sapuwesikujejezuvopoji.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/42632870958.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/83050497862.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/m6rl7h2hbao5nbcb2bk5vbfn05/lugiloposadufogevu.pdfIn PDF document text
    • http://skncn.com/u/files/wodakalagilamaluxob.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/laxawi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613135b0a2ba4---suvevudotapodamaxovusaru.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202195135835106.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/47765919474.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_032949.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/wixebukoxenita.pdfIn PDF document text
    • http://wjcopy.com/upload/files/vezupidabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+wrong+turn+5+full+movie+480pPDF 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_off0000d5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 11468 bytes
SHA-256: 3a266d712c377cd64d0908e54fa3501bd575ffe63d7e3f4bbf32aa4b0e3b9aac
font_02_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 17528 bytes
SHA-256: c607ad41895dbd01096c0c2dfd34867c9faaca98e0ea39fa43cf70ea8e289ac7