Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fff5b3e8d2f579d…

MALICIOUS

PDF

75.6 KB Created: 2021-10-07 20:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d03c945f9b55048fd38dd16538b8990e SHA-1: c7416b40db1e44ac73e2730d31967b0e245a4f0c SHA-256: 0fff5b3e8d2f579de76ddc22ab2f6bb19b7075e59947cd5fe0075c80b7a37cfc
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 further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically identifies this behavior, indicating a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest a malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=the+lady+in+dignity+kdrama PDF link annotation
    • http://mindennapi.hu/upload/file/zezimofifevunapagub.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/23477082157.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/24925569033.pdfIn PDF document text
    • https://sentralperdana.com/file/xijadexegen.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/4736695373.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161491dba89d58---loxofiz.pdfIn PDF document text
    • http://0048.pl/48files/file/nujipezesixi.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/42390514394.pdfIn PDF document text
    • http://goldia.cz/data/file/zexunoforezesuwipemaxuto.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/98736066233.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/vitijasidozizojubipeg.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/4291619558.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/bidaxojopodolikagutivama.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/75641278962.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/bigufaluduz.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/5809610940.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77286710764.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/xeretuzatam.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/33305713526.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/fejivukaro.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/lujodunufolafapajufugu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/kifaruzefufadebad.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e24c5623ce---79732460084.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_off0000c3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AB 17452 bytes
SHA-256: 422c85ffa56fe3cb2f36b08f93687199c94bd819585ba6d47b029f42f9db5ad1
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10576 bytes
SHA-256: ed54a76c433f8dd47740d8f7ed9bfb611c66e5a1f8ff2700cd3e518592a12540
font_02_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1