Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5b9be032795ae0…

MALICIOUS

PDF

81.2 KB Created: 2021-03-30 12:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0b6f1a0493737f100ea0e0bb74976c80 SHA-1: 40af57d2c72597e206e7a9a29abd18d958b1d106 SHA-256: 2d5b9be032795ae0505280437dfc4ddfb07288898cff72a7f2dc14eab35753c7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDF documents. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a tactic to manipulate search engine results or to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=borges+library+of+babel+pdf PDF link annotation
    • https://cdn.sqhk.co/wisivelu/ghujim4/crofton_hammond_infant_school_ofsted_report.pdfIn PDF document text
    • http://turosofatilez.iblogger.org/kenmore_coldspot_ice_maker_freezing_up.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/what_is_the_white_queen_based_on.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/bahria_town_karachi_map_download.pdfIn PDF document text
    • http://soluzixod.66ghz.com/44530357400.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/GXif6hc/runitobuv.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/82199066734.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/hugj5gg/44772460215.pdfIn PDF document text
    • http://nopuvobetag.mygamesonline.org/translate_portuguese_to_english_free.pdfIn PDF document text
    • http://selitir.iblogger.org/western_digital_tv_live_streaming_media_player_c3h.pdfIn PDF document text
    • http://dajobod.getenjoyment.net/2106875376.pdfIn PDF document text
    • http://bepufuz.22web.org/domain_and_range_of_function_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_ba1d44d18fcb486f849240e9472aefb2.pdf?index=trueIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_a86167e6d5954dfb9346486215d30566.pdf?index=trueIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_b5cea984583545d081e6babc20aa4851.pdf?index=trueIn PDF document text
    • http://misebupafavo.rf.gd/buwenajeraz.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_0789b3f0b10545159cb71cef7cfb548e.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_411c329bb831423aa97276395fc05292.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_b400a7543856433e8e6dde453f96c367.pdf?index=trueIn 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_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 5500 bytes
SHA-256: 50157139076eb59367d2c58b42cc926fcc9f6cf156e8d9113e610602ae5a2368
font_01_sfnt_off00011326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11326 10940 bytes
SHA-256: e6bcbec776389f25e73fab85eee4a643be87b8d99e4961d4d8615f7290111cd1

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