Malicious PDF — malware analysis report

Static analysis result for SHA-256 406a44013b9343aa…

MALICIOUS

PDF

77.9 KB Created: 2021-02-28 13:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6c6dddde279d56f025a4ebab5aade295 SHA-1: 80b1c54c030c104843e78b1393d5c5803b28de57 SHA-256: 406a44013b9343aaba8fd9291407fc9e734046d839fe286af7ad54e9f079060c
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or distribution network. The document body, though heavily obfuscated, appears to be a lure related to 'Excel spreadsheet tutorial 2016', aligning with a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=excel+spreadsheet+tutorial+2016 PDF link annotation
    • http://afracheat6.xyz/93781847377jjcwq.pdfIn PDF document text
    • http://armada.technology/tattoo_tycoon_mod_apk_downloadm2jiv.pdfIn PDF document text
    • http://neo-tp.ru/difference_between_cascading_style_sheets_and_htmlkxgkd.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/61400793204.pdfIn PDF document text
    • http://shoop-fr.ru/angularjs_form_example_plunkerqfuus.pdfIn PDF document text
    • http://hookup754.fun/29028274990gqfvs.pdfIn PDF document text
    • http://sallles.ru/killer_instinct_ripper_415_owners_manualij4gq.pdfIn PDF document text
    • http://instapriz365.site/joyce_meyer_bible_study5kagb.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/best_operations_research_masters.pdfIn PDF document text
    • http://itravelgr.com/sumuwanomamefakemdbg0o.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/is_project_management_a_good_career_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/wevosevob/ijfha1y/mijapokezuremikukasobi.pdfIn PDF document text
    • http://storeplus.pro/fbi_fitness_test_scoring_guiderllbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozogasivufi.myartsonline.com/the_adventures_of_huckleberry_finn_plot_summary.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/59995182199.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_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 5664 bytes
SHA-256: e1e133c4f4ede60e0dd178cd597b4067fe93dbb97f0141745bf9c74410074b50
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 11024 bytes
SHA-256: 7276b0eb10810149ffdb6e0bd873d72235d65280118d85adad9dbf6210a00b7e

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