Malicious PDF — malware analysis report

Static analysis result for SHA-256 11caaffcb1a73fba…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 09:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b5fa81e7ed1f9ede94b4c73eb29f15d SHA-1: c7141b245831b162138daa521a88c101f6917fa1 SHA-256: 11caaffcb1a73fba5680375e7a08da9abcd15fea616fb1823ea391d76134059d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely as a phishing lure or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=hack+another+phone+apk PDF link annotation
    • http://heyumpnd.com/userfiles/file///lajokutututuwedumev.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/roxogesepibavukixod.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/5802701994.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nutawimamofunu.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/43710601027.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/xugugigefafupakefenubawuj.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/89437909389.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/retavuruzeradexoguzutiba.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/76981206130.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/31951231359.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/4085007361.pdfIn PDF document text
    • https://eklyps.net/images/file/54555348197.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vofigutezekabitewif.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87539533609.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/73775714364.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210902232842.pdfIn PDF document text
    • http://underbutter.cz/download/foto/nobubufegosutezoxinazexod.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/tonila.pdfIn PDF document text
    • https://pellevah.com/upload/files/teregavadejolusasup.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/81432657820.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/29374396546.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_FED2D27166323ED3.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_off0000c13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13B 17528 bytes
SHA-256: 8797afed70808fc3742a1fec4ea7a4f2e4f0522321700e4bc8d680ec8b1a84b6
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 10248 bytes
SHA-256: dda85c65e73254a02eaa4334843f27fa394d8e8d0c4a88ada2a607459c9b598d
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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