Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5448928da1a3c9a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 03:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82259177de3f0a47e59bd0a29f7d96dd SHA-1: eda5b0fba56e02a7cb42573bcb8809c6b16c0e1b SHA-256: c5448928da1a3c9a8bf8233f0e46d8f154faea4315c7a13ef2eac46267357d0b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is structured as an image-only lure, typical of phishing attacks designed to trick users into downloading further malicious content. The presence of numerous external URIs, many pointing to disposable domains, further supports a phishing or link-farming campaign. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.gieskestukadoors.nl/ckfinder/files/files/50299104276.pdf In PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145324ef0e07---jikatalegezig.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/mogilidozosu.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/49307525034.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/jesavazigopoxuxosakab.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/kabudipuripuj.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/70252162750.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fowil.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/wetenunaguji.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/2835194784.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/vukopukaganavegen.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/93350870576.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/53929151426.pdfIn PDF document text
    • http://keitbg.com/images/files/53320427390.pdfIn PDF document text
    • https://chineseclothingonline.com/File/7160957309.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/95902040145.pdfIn PDF document text
    • http://abwva.com/uploads/files/51108082975.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/telalixowagi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e34b2efa5d---16884009801.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/sowubumabufolufogufa.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/38423916305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=vidmate+apk+download+free+for+androidPDF 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_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 14208 bytes
SHA-256: 7e3a46f0ae7e8df3a0e385a71e832989a16a3f62259b28b1b51f5944642e2e6f
font_01_sfnt_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10636 bytes
SHA-256: 917d52c9d86bef322df9e8d0a9b1e717fc7760612e32c0a9c2159bfecf3ff0e3