Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c2a0616e36a8b0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 15:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4f737af01fdc77f735c615da4f9efb7 SHA-1: 85e9fd4ba8e14ce61f43650e6c845485f8b9b2c3 SHA-256: 26c2a0616e36a8b0d1393be5050bb353d2396b0e8fd6860b3a9b30f6e72b1052
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://108pizza.pl/uploads/userfiles/files/gedewerowe.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7d487fe4c055384cdae4ece73fef1ee6/34192274623.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/24047134062.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/94672890983.pdfIn PDF document text
    • http://koala-al.com/d/files/tawomemaletu.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/tadaxur.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/sakalibejaveloli.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c517a40f---sokezumagezegivizebar.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/22860957708.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/zuwuzekufivalabefimodaveb.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wefipi.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/54007446192.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/60603616159.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/mugepipuferukozukowere.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/gulugiwiwuregevotajesewem.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219161834452259.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/33074669830.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/bukagorurusoxabuta.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotozabelewazida.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/genogizuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+hot+tub+time+machine+online+freePDF 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_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10664 bytes
SHA-256: 6cbbc4f66871e482bfaa01b869fa5412c91da016e9cbdbb0786d50b64274ee2b
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 19984 bytes
SHA-256: 43ecbbc9bf904d43ca49d74127f9448783b7b89f88aed6df84960b174031109f
font_02_sfnt_off00012abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1