Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecae80eed34da50…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 14:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ad4ba9872c7d6d8a27f03125448e9644 SHA-1: 8372be2e441ef2d22d34848ffe4eecb2918322f3 SHA-256: fecae80eed34da503b7bb9898dbcec67c892633b7e264d30a0650331e7b22cea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://gaushalango.com/uploaded_files/userfiles/files/wanakozulol.pdf In PDF document text
    • https://vsetinrally.cz/userfiles/file/65038600414.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/fotobizinenovadeletajoxu.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pumorujatupaw.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/jisexudisegarika.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210906/file/61403592845.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/23757195557.pdfIn PDF document text
    • http://oilspecchem.com/files/remojuwax.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/59567730167.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/63875029033.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tojexibasuwakaxegajesi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/riwapekagulifeton.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139a37d7b614---vezobibuzoza.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nuzaserupadiveresosat.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/sofenuzefefefana.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/5326399374.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/zapeki.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a208bb4e10---15750194974.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/fazopolibezezokigoxeb.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiwoxebisoledirobaropetaf.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/66653930041.pdfIn PDF document text
    • http://atomleasing.ru/media/File/2382417069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wolf+launcher+tv+apkPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 10568 bytes
SHA-256: 332227d3ac46371c7852adaba392e9d81fff1b315ffaa9ec200561612891cfd5
font_02_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 18176 bytes
SHA-256: c155619d59b9319e044c4d59d8c145c927b3244cf3468aae72f66b84e0e47457