Malicious PDF — malware analysis report

Static analysis result for SHA-256 89798612720bd947…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 21:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 796c0afbc9d114a75b0d418de3ed8630 SHA-1: 1540a8e5631a7cb1c4602412adada5d44042a809 SHA-256: 89798612720bd947f1fdd7181969bd1d9218e25ac54ada1b894920b6e0c837aa
134 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 point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mvdeastudio.it/userfiles/files/puxopo.pdf In PDF document text
    • http://www.cavice.fi/tiedostot/files/jumidubofopi.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/jininibekenidojudazesunen.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7003416439.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/sajotigak.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xoratazowisewepo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210923001659467.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///tuvabifuxo.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/51211252667.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210925232221.pdfIn PDF document text
    • http://atomleasing.ru/media/File/masarizu.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/64939701450.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210913083648.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/81121707657.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/8452830494.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/88251359623.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/86054128687.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/69785399643.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/tubedawetuzuvizozodib.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/70830285057.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/tutejofisatajebifukipeb.pdfIn PDF document text
    • http://acelybio.com/upload/files/zofazukimesak.pdfIn PDF document text
    • https://rn62ug59c-to8.com/contents/files/87709736597.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/66587961128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+flash+rom+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_off0000c23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23B 10564 bytes
SHA-256: c3669dcdefe3fbaef6a7dc0585a383667360318b377751f63d50aabcc050d88e
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 19276 bytes
SHA-256: 80428107b94a6b1e5ae3516d768fd9ecf747054909b38afbb6a5c0f25604faf2

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