Malicious PDF — malware analysis report

Static analysis result for SHA-256 847d930b75db4d5a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 20:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68041f0f274c4a1ae4ac44906341f7eb SHA-1: 31f86a9c13d597bd8d36cf974175f8f63318c95d SHA-256: 847d930b75db4d5a406edb2ca610cb94119825a404f9d38e8be91750e3f1b426
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it's designed as a link farm, likely to obscure the true destination and distribute malicious files. The embedded JavaScript and the nature of the heuristics suggest an attempt to trick users into downloading further malicious content, possibly through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krajinar.cz/soubory/files/23075397328.pdf In PDF document text
    • http://mprime.net/ckfinder/userfiles/files/888623574.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/12201457556.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/wodojirozivuralelo.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/sukekujoxesuwalemetizo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/46223177444.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kuruxufigem.pdfIn PDF document text
    • https://jotelek.hu/files/file/41833262393.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/wejuda.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109071558025261.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/nofolubamewovujo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fexuxazixalapoda.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/80571185341.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/3993380603.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/sizeda.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/purepuwusufatulufit.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/43688133872.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/77444154405.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec9beb91a---76130367005.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lufuvodibefilurewa.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/vuvofokukaxomijenuvipixe.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337a5d8b098---xagabilisesiwifutadu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/1259087396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ablota+hack+store+downloadPDF 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_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16412 bytes
SHA-256: 10aecda12cc08cc01a3c8fecd0d5e158fe3bf4a9c2db9875adf7a9b3f14c773a
font_02_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10672 bytes
SHA-256: a050ee603b027f2128d11afd8dee617fec8a50a771df4e0f7d7c41e1754d2178

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