Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3455e8f503342b…

MALICIOUS

PDF

106.4 KB Created: 2021-04-01 14:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 82f82d527fc199c6a6f162f4854e9e25 SHA-1: 57357dfe3dc5093e4dc5a2ef8e68cd5b9d95876a SHA-256: 8a3455e8f503342b4711fd839f41d63e996249d1b08067f465fc168318d24550
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'botokaw.ru', suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that this PDF is part of a scheme to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://botokaw.ru/award?keyword=storytelling+livro+pdf+download PDF link annotation
    • http://sagunutu.medianewsonline.com/statistical_rethinking_richard_mcelreath.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/bigimuritedinoregi.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/woodworking_for_dummies.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/adultery_judgement.pdfIn PDF document text
    • http://tewosube.mypressonline.com/automation_testing_books.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/lorarok.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/dlghfVD/frantic_synonyms_furious.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/QsJjiwq/game_launcher_app_for_android.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/sidepanekukolirela.pdfIn PDF document text
    • https://cdn.sqhk.co/tezikegoj/wgcuihb/tubadumox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7644344-66be-4b68-9858-546d72690c4b/5_dysfunctions_of_a_team_assessment_questionnaire.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/amoeba_sisters_characteristics_of_life_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad45064-c764-4fb0-a2e2-86a36e29ac44/zanedez.pdfIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_62d52e77cb9e4c038f6ea46377a603db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/244ffdd7-7c17-444d-b40a-6ec2bf93efcb/25799287278.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_9d39c42c81d347ebab89e3e661df6fa7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woberiz/planeacin_estratgica_idalberto_chiavenato_tercera_edicin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9332ae3d-5270-4a51-b2ba-8abea9a34d0d/the_diffusion_of_innovation_theory_in_agriculture_was_given_by.pdfIn PDF document text
    • https://564fd4a8-0e6d-4f97-813a-a14a70c45316.filesusr.com/ugd/f90d28_3d14e1a97a0340c6a7eb3e01fd931654.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_f6f42977e87b44e29c13d9d7f91165f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/one_touch_ultra_2_glucometer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/cicerone_guide_pyrenees.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_off00015bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD3 5388 bytes
SHA-256: 5a66fbf83251770a89e6e4bdd74eca82dd940e1d451280d1515c3dd7004fbf53
font_01_sfnt_off00016e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E56 15652 bytes
SHA-256: 5ab7b79990b5f226f482be34f9d2b296a871b48fcf9aaf1d701c44106aa982cf