Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18c47d65ffb3207…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 01:06:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ce5f686b9815504bcde878cfcc48bbba SHA-1: d4236c35cc91cd72fc93dd2cdc4170fbbd61ba06 SHA-256: b18c47d65ffb32075952c2518ba1b756e4da81bb1fb778beb06b4a199b5e7f9c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though truncated and obfuscated, appears to be a lure related to study guides, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. No scripts were extracted, but the presence of external URIs indicates potential redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=clep+college+algebra+study+guide+pdf PDF link annotation
    • http://lotupojaxuvutix.mygamesonline.org/familia_bromeliaceae_caracteristicas.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/define_rhetorical_device_literary_term.pdfIn PDF document text
    • http://sijuvibitita.iblogger.org/towovosininata.pdfIn PDF document text
    • http://penarakagadek.22web.org/area_and_perimeter_of_compound_shapes_worksheets.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/68677847603.pdfIn PDF document text
    • http://palumurawisan.22web.org/reresilaxidifoj.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/inspirational_quotes_about_life_and_struggles.pdfIn PDF document text
    • http://gitikevajup.iblogger.org/quantity_surveyor_report_deduction.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/model_balanta_de_verificare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijularof.epizy.com/how_to_reset_a_motorola_walkie_talkie.pdfIn PDF document text
    • http://ramenejepom.rf.gd/introduction_to_calculus_and_analysis_2.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_0265fa3b48cd42e18497c0f074ad932a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/jusonusegojexa.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_11eaa6ea018b497696a0ca277e9155b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/85173472175.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_13dab9fa5c264baeae9bfec6122744df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/logical_reasoning_test_shl_answers.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_4c5e22a8885542ed94f05f34d452d092.pdf?index=trueIn PDF document text
    • http://bozexefuj.epizy.com/how_to_draw_a_dragon_chinese_easy.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_d3bb4c014f584c929d0f728ecaf6cfcd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/buxizozorem.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/anabond_652c_data_sheet.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5472 bytes
SHA-256: 3b682313f9a5201cab2043af2732141f09ef2715a7fd5a1fd7a1380a6a1d4687
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 11316 bytes
SHA-256: 087ed9cb7d56b5b35f32b34aceb57945ec0de0648f335e57e8bb1ba73e5fff14

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