Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0f326d2c156fe8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 13:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e78bbbfc7b2ecb84852ce14046faefac SHA-1: eb4b34bfa98d3ddef773fc2baada11905661778c SHA-256: 8c0f326d2c156fe8816fd0fd357fb32813adc5dc556abf1e60ea4f0f432b3171
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nomylo.ru/uplcv?utm_term=drools+developer+guide+pdf PDF link annotation
    • http://alvitraders.com/files/8012774106.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/87294731651.pdfIn PDF document text
    • http://gewald.ru/content/Files/vapavisasutugeloroj.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/gamupuset.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/83780687850.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/17270929363.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/vopalu.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/bosuteniteziwizude.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/90771224998.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/nanufewexodaxin.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/48195706151.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/tixisoginijoverawex.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/nikezetokawa.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/30814558281.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/8837434109.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/tebebiwupazade.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/wagesofugojuz.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/vugofuweratalalutajufumix.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea62766d87---watetolusibifodiwevuk.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/23380902876.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kijukasexilovisimurum.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/mejotulajafeso.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/fufanozijumepuvav.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xozajejojiva.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210906125553.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/402688506.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/muvevemonamuzobuj.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_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 18132 bytes
SHA-256: acb7215bdccc24040fbfc0f78d2149eafa197dcdb9c0e7a3d6f0c59904bb9845
font_02_sfnt_off00012980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 10476 bytes
SHA-256: 6289449af103c5d92dc52814a06f16520419d1a0b556724fb9ee0fe2f06f5c63