Malicious PDF — malware analysis report

Static analysis result for SHA-256 113e29b2000726a3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 23:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fcf1092531637f69285f53dd568a4bd7 SHA-1: d2b50626f9ffc2f11feb0caa426cf117ecffa425 SHA-256: 113e29b2000726a3f50c303094c0e63dfbb421c39cc578311e86c902c861a115
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81430203902.pdf In PDF document text
    • https://esprimagroup.com/userfiles/file/lopapovegaratofunudibor.pdfIn PDF document text
    • http://pk.mo/userfiles/file/furazokevor.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109030245342325.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/29635996854.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/26790783140.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/fekos.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/5186353348.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/89201049868.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/86598008206.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/wipazofiboluzonapanuworo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kotovekaxelibudijodel.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/renobas.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xikemelotisotej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c5f437d6eebee3d1d9d76a34927b37a/raruzetopum.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613109e5338b1---kovat.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/20875295550.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xefudesaj.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/molekup.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/10787384964.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210907190349.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/7702234397.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/nufarifexitogifupi.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/77459477072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+system+updatesPDF 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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 18800 bytes
SHA-256: 2bbba6e797d7e9c4ffdb1f0f47c2024cd396741e71f422a1f387ebac667eae4a
font_01_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 10704 bytes
SHA-256: f1515223c15c2327b93b29d328b868fe5f75681982df29018d6be853ea3f2c8d
font_02_sfnt_off00012e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1