Malicious PDF — malware analysis report

Static analysis result for SHA-256 40043e219ce74235…

MALICIOUS

PDF

74.0 KB Created: 2021-04-14 16:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6c28a149c6e72e00b17aa126f95d1c32 SHA-1: 2c9faec8e6a26458a5461791d30db745988014f9 SHA-256: 40043e219ce742354a3c9db9c6805fd2848bc49e3ba909fa2d4731d03802098c
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, designed to lure users to malicious sites. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=frigidaire+1.6+cu+ft+retro+mini+fridge+white In PDF document text
    • https://cdn.sqhk.co/mawodoso/IvpPign/ricetta_capesante_gratinate_con_formaggio.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/jaShhic/idle_knights_mobirix_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/kjfnnJq/finding_blue_free_download_apk.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/f95475cdd816ced.pdfIn PDF document text
    • https://valetapos.weebly.com/uploads/1/3/4/2/134265584/gujajitoworifituzuf.pdfIn PDF document text
    • http://xenojupu.mywebcommunity.org/xakajofusapagufijugos.pdfIn PDF document text
    • http://jetiloxabutu.iblogger.org/bizagi_para_mac.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/sozewuturawexirudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_6cf4f1e60b3e499698ef3d3c18795fcd.pdf?index=trueIn PDF document text
    • http://muwodanodobe.rf.gd/lawotixazazudugi.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_0bc98c75bdf24eaa9edd3781d2e2b409.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_a7f80b44bfb04f0087997709647498a4.pdf?index=trueIn PDF document text
    • http://xateguguf.epizy.com/fizjoterapia_po_endoprotezoplastyce_stawu_biodrowego.pdfIn PDF document text
    • http://maxefaronuxugur.epizy.com/tumuputiporowas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be6db19-3410-41a9-8f64-4f51a01cbfdf/the_options_playbook_expanded_2nd_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0537757a-b809-4e38-a36c-1925ab071f6c/how_to_use_clean_function_on_mr_coffee.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_335d92a70138428499b6828865635a7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f7a894-564c-4b1b-8203-21f8f81a91d6/sorelofimetasarivoniwer.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/72529139402.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5512 bytes
SHA-256: 66f521db9e43598c24f305eccf46cde3057dbc40e497038e3e85afb5354d5a59
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10964 bytes
SHA-256: 7306684214d7580c3e9b690d08df546368e5bc07ee57c44fcc1845f99cc693c4

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