Malicious PDF — malware analysis report

Static analysis result for SHA-256 359cfaf83fa75d16…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 03:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6fcf59e36c0817e4505014b9743eeac4 SHA-1: a35ca72d43a10fa1b7ef6e58715e2de021d2073c SHA-256: 359cfaf83fa75d168a2e92e4ac62ca42ebbacaa284c7a7ea4ebfa90053da796c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and the link farm nature strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=globalization+pros+and+cons PDF link annotation
    • https://movimientofamiliadejesus.com/images/uploaded/file/97906115152.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/60921147082.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/mejewigilizapisibuse.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/renirom.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/dudugelatuti.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/koduroraralilavibuvut.pdfIn PDF document text
    • https://beautydent.hu/editor_up/12668347075.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/tetuwaforiwuniniwipibuja.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/rakozadamivokewu.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pegukovopamunesor.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/buguregup.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/sajotipupuxafakoparov.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/fezilerej.pdfIn PDF document text
    • https://soechi.net/userfiles/file/92948935536.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/73619994907.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/50384313221.pdfIn PDF document text
    • https://basisnomor.com/contents/files/71712574320.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fapapuk.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/fejiwomoxusuduwixol.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/58282146686.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/25260700340.pdfIn PDF document text
    • http://101balkon.ru/upload/files/28388113388.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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 16520 bytes
SHA-256: 427b8da29e8b12e945ce7d200c881ee43f7c8fbc27e997f40d316bfb9280c1d0
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 10616 bytes
SHA-256: 7f69fd3ae8d2cb8c004546b75139451f5154832d8d376529336b44eb7d15cc43

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