Malicious PDF — malware analysis report

Static analysis result for SHA-256 8279d5dbe7437fbf…

MALICIOUS

PDF

107.4 KB Created: 2021-04-30 13:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 32984283da16c327004c039c8571aa44 SHA-1: 9892622f5e22ba066e918a96bbc59d952e1c4d1c SHA-256: 8279d5dbe7437fbfbda332149274c95b51ce4e5e0d0685327002c6e1da48e472
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of numerous URLs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://baarspo.ru/strik?utm_term=is+the+philips+norelco+series+3000+waterproof PDF link annotation
    • https://wabumixa.weebly.com/uploads/1/3/4/5/134585451/gijimog.pdfIn PDF document text
    • http://ferabugajefelam.mypressonline.com/aplasia_cutis_congenita.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/gowowiki.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/sW3ibhc/prendre_conjugation_french_about.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/jfXhfXe/home_design_my_dream_garden_apk_mod.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/80716.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/1mjipP4/oxygen_level_chart_copd.pdfIn PDF document text
    • https://xovazarorofo.weebly.com/uploads/1/3/4/4/134457653/luwajotekegami.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/gdidUig/pujule.pdfIn PDF document text
    • http://raliwoliwogizar.22web.org/pewezaxones.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/tc_nova_delay_factory_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/vekokoze/cuhcehe/beat_hazard_ultra_apk_mod.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/building_computers_for_dummies.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tubagawidi.epizy.com/tijowabe.pdfIn PDF document text
    • http://pikezega.epizy.com/75125253022.pdfIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_d1b8209555b148e19df61d80a296bd90.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_6104029befdd40fc82bb44fd1a02c8af.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_6560dd2e78e747b7af5bcd67f16d58f3.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_6df3270f5ab54c5394d474c418ae79be.pdf?index=trueIn PDF document text
    • http://buvafejeles.rf.gd/anatomy_of_animal_cell.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_54041381149f410ba87ed144d636f378.pdf?index=trueIn PDF document text
    • http://tosodesuvivat.epizy.com/cdl_medical_self_certification_form_texas.pdfIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_5298c62493ea41389c3a26720ae42a57.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_e019aef9a8cc4b1dadb9fc869810b39b.pdf?index=trueIn PDF document text
    • http://kubomefewofumim.atwebpages.com/gokugadosibanuxug.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_1ffc7880ba8644fbb2b0007a71a4be08.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB9 5436 bytes
SHA-256: e2e619624214059423d0e6ee7888507d06e415bcece8ecbfd2638027ca9dd76a
font_01_sfnt_off00015f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F44 12456 bytes
SHA-256: dbe4d21a68777052cee77ee6d7e859643bf7537dd4b8c3e07565d008405ac219
font_02_sfnt_off00018939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18939 16396 bytes
SHA-256: 13f58138323a6350ded3d1b54fcaaba16df54fc54940bbf8a11e8318800a2697