Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d14f61e71b28c94…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 21:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 394035377f60518f27e63a2da47e81e4 SHA-1: 5c67c88936146d4158c1b27488ff878879d314da SHA-256: 4d14f61e71b28c941fe0832e216a8979889168ff672fadc0c4a12c4c513d7721
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains multiple external URIs, including one pointing to 'resalured.ru', which is likely part of a phishing or malware distribution infrastructure. The PDF's structure and embedded links suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=assistant+professor+job+description+pdf PDF link annotation
    • https://cdn.sqhk.co/wujodazera/GjbegiO/duxasuzumuwez.pdfIn PDF document text
    • http://gouliwer.online/libro_de_historia_5_grado_2019_respuestasfqbze.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/bLM0gcQ/dragon_warrior_3_gbc_personality.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff3ef94b818a.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/wubogobaritufabusezaju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381531/normal_5feba118b8404.pdfIn PDF document text
    • http://arevakar-travel.com/the_merchant_of_venice_quotes_shylock8k8h7.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/holt_mcdougal_larson_algebra_2_online_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483870/normal_5fcac89044e96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464082/normal_5fdd6c167b15c.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/97515437122.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/ehfiayN/gelupoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424666/normal_601385d821354.pdfIn PDF document text
    • https://cdn.sqhk.co/mabuviko/gdzihhg/beiimaan_love_mp4.pdfIn PDF document text
    • http://viteroludobano.mypressonline.com/97740668044.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/compendio_do_catecismo_da_igreja_catolica.pdfIn PDF document text
    • http://firstdoctor.xyz/3.5_cleric_featss31vm.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/surah_yaseen_audio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buzumigasox.myartsonline.com/animal_cell_and_plant_cell_diagram.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a37979db567e49c18c52d9e0acddca50.pdf?index=trueIn PDF document text
    • http://wutejaxevewef.myartsonline.com/how_to_replace_s9_charging_port.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_db45e8f644f64aa492b50c3c6c754093.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_d39b413ade5e42a281e8c3e6e49a4462.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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 5320 bytes
SHA-256: dd6a7d0a3ea6b7fbf9738d2e76240ef6373b178efd48cf221ddea06c6f9b312a
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10508 bytes
SHA-256: 4b98baccb6606c9437a6e7b87a49cdd0d5730fdb79f7112697809a48b2c6da12

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