Malicious PDF — malware analysis report

Static analysis result for SHA-256 658ce27b2aee531b…

MALICIOUS

PDF

79.8 KB Created: 2021-03-27 14:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25c2e0952d424b90a34ac4fd51adb395 SHA-1: 996679b77f9a28fa02eb1b8e1271eef65b803977 SHA-256: 658ce27b2aee531b7569116fad9ca0faa18e89916364a8e7b0e0422019c28c0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=actionsheet+react+native+base PDF link annotation
    • http://pidijajuwupurop.medianewsonline.com/denotation_vs_connotation.pdfIn PDF document text
    • http://makipoduzoru.22web.org/budirabefunep.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/gufodo.pdfIn PDF document text
    • http://sodalabs.club/51232491469ah51i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447253/normal_604cde401f763.pdfIn PDF document text
    • http://nukepaxin.iblogger.org/paragraph_writing_topics_for_class_9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fff77f7dd85f.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/does_dell_latitude_e5400_have_a_camera.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/80756922124.pdfIn PDF document text
    • http://net-klientov.ru/33466730201x9iwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/69671618221.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/zupezizavifejolelugen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/831f5bbb-df91-4852-ac8c-75ddd4799ea0/behringer_xenyx_1202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa0db2c-bcd9-4f7a-a346-32f78d670996/pexodid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89552bde-2fe3-439a-8753-b59e2ee89190/how_to_register_vspace_manager.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/arlington_va_hotel_tax_exempt_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/44556297989.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/91395128683.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 3776 bytes
SHA-256: 7abee62b52f2f5c79443d0e7cb432644f7437fbc466beaf7cc6d102eff3a4b64
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 5044 bytes
SHA-256: e3e9e027a38e1be117e5509e04c4ec6a33aef86e60273bacb7c4d8b29a1b123f
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 11000 bytes
SHA-256: 44773bb6f13bfc19b1d377eb1be448d5e7d312ec0f38af41bbbe3aea29614162

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