Malicious PDF — malware analysis report

Static analysis result for SHA-256 3771f419da77730b…

MALICIOUS

PDF

91.3 KB Created: 2021-09-09 16:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c696a94f43b2abd69e199df3791b0cb SHA-1: b3340735ffd81b4cbd5bcaa635991e9f04e5024e SHA-256: 3771f419da77730b7cf39e9b5931e66eb5a06ee3faca4d5301a1448a37316e69
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to lure the user into downloading further content. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://fuerst-architects.com/uploads/file/66903086621.pdf In PDF document text
    • http://caphegiabao.com/upload/fck/file/ravevunumopegidesagaxekul.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219675701608.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/35143889560.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/87585412322.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sasabitavubirul.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tuvesoluzozagexifumirem.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/46969558134.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15344747276.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/siwedimi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/69661634314.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/16651460982.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/46247464846.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/1176970116.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/zupalere.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/59677443301.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/67280789541.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbecf0ace---bozaxoza.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k3ohie40cg4nmdtib8scs0ik99/jefebozozus.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/59697599704.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-02-05-49-46-16.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/34276986574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+it+full+horror+moviePDF 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_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a
font_01_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14719 10704 bytes
SHA-256: 9364bc6c4a4957335e25c8dab411ac7878c8fff16015e203db068ccdf5ef2b45

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