Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67cd2d5e9fefda1…

MALICIOUS

PDF

76.1 KB Created: 2021-06-01 09:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9a439655e2f9a5ab196162d9d8cd7257 SHA-1: 2ce30120b4696a77f58852ffb1a4f3fbc70080bc SHA-256: a67cd2d5e9fefda12ba43ab8514f9aaee1da4a88dc906b60951285c8e2314701
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://archism.ru/pbw?utm_term=current+withholding+tax+rate+in+ghana+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454546/normal_6050b1cf4b186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5ff76f7451906.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/8068127.pdfIn PDF document text
    • https://vorujefam.weebly.com/uploads/1/3/4/3/134322124/zekegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_600dd3a2a79a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fe83b287f3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_60297a23dc670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484995/normal_5fc6b33978b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_604a575d62936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407084/normal_5ffc7bb7be22a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_6057161f12191.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/da507b59-6544-464d-9dfd-447adf0b4f49/vitowekilefaxekon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eefddbb-6957-4909-89e1-df2d34fb9f1e/how_to_install_lg_washer_and_dryer.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144425019/how_to_make_debit_credit_sheet_in_excel.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144443568/analytical_solid_geometry_free_download.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/luped.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/w/file/fetch/144446223/wuponadupazozopuvepabof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c11e7c-b070-434e-a757-eaad73688b47/44752866086.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144437298/best_hollywood_movie_download_in_hindi_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec25f896-5aee-4517-b8b3-09337087e698/fokobiv.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144423540/recommendation_letter_for_kindergarten_students_examples.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5456 bytes
SHA-256: d4d5d7e409920bc1662143dbd7d8bfa1299f86dc075587ea6bbc2f417fba6677
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 11440 bytes
SHA-256: 6e67db572fc33c4366f5e826c9c802318a260a7600c9b2ffc85de5ff9af8467b