Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a827ed2b5aebaa…

MALICIOUS

PDF

69.7 KB Created: 2021-06-02 20:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3cff2608cf2a2c70dccf02e9efc0bdae SHA-1: 68ed7c5af7bea70cb10bc7a4093ba57906d04196 SHA-256: b9a827ed2b5aebaac4422d87532e8e9d74ce986f46d199e131e559806b9d07b0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://huntic.ru/pbw?utm_term=everything+stuck+to+him+raymond+carver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404293/normal_600bdb963d041.pdfIn PDF document text
    • https://ximuvibimujobu.weebly.com/uploads/1/3/2/6/132695583/ee16bfd1b3cb16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_6003e9e521290.pdfIn PDF document text
    • https://sowupetu.weebly.com/uploads/1/3/0/7/130739285/wajemizinulav-pixepivup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_600c21452dc63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_6033d69e8ebc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_600b100e193ed.pdfIn PDF document text
    • https://kekipefawaro.weebly.com/uploads/1/3/4/5/134588225/1993960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_601e43ef0674b.pdfIn PDF document text
    • https://navijaxilof.weebly.com/uploads/1/3/2/6/132696044/ruxidefezuvupuwowuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144419514/make_your_bed_mcraven_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb2de35-d2af-4962-bae8-08f936689e7d/kixukezibanunapupeloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76192a24-1286-4d87-ae15-d24eebec821e/risk_assessment_checklist_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2b8cc5-4b67-4d2c-b341-014542927146/xakebenodasowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb93c16f-1f4c-43f9-9371-195b6d98f5ef/71107473528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8c73fd-046f-45d6-a05f-d4e434cae532/plantronics_c052_setup_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2577ba6c-7b9a-4ca8-85b0-bf0f6d598181/repisefupusukajijeniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36cc17e-08bf-4d2f-99ef-79f9e040a429/disneyland_map_2019_california_adventure.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/pirates_of_the_caribbean_1_tamil_dubbed_movie_download_kuttymovies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0532ee57-b2d9-4416-8f7f-42f9660d2b68/patetinaxip.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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 5504 bytes
SHA-256: 18d8a206fd1e4fe1b3ed0b1d8091e32e4fb34fa72fd6f09c3cc6ce2fe45aa8d6
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 10508 bytes
SHA-256: a496c1b3dd2fb63574d2a3920b586c94c3f674fb4dc19d764b12bdcc29fe0e24