Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d423445b04c4de…

MALICIOUS

PDF

70.0 KB Created: 2021-03-23 06:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a81493135f82d82a34e1abbd1cc2d61 SHA-1: 91f613aa83488a3634aa5ce34fa714d025e2cf6a SHA-256: d1d423445b04c4de338e24e91268a53b680510eeb951f4093f6910f259630d12
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=libro+cerebro+de+pan+pdf
    • http://jitokinut.iblogger.org/the_penelopiad_by_margaret_atwood_play.pdf
    • http://jubemexor.22web.org/minimum_pitch_for_corrugated_roof_sheets_uk.pdf
    • http://nexagufobutuf.22web.org/how_to_write_an_8th_grade_book_report.pdf
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6032f59311fdc.pdf
    • http://pokafujadiso.iblogger.org/nokizom.pdf
    • https://static.s123-cdn-static.com/uploads/4479441/normal_60097982a24f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3e28227-951b-4cee-ab0c-3209147ad354/monkey_business_gta_v_mission.pdf
    • https://s3.amazonaws.com/risisipajole/39062596211.pdf
    • https://uploads.strikinglycdn.com/files/a8edcb9a-0b05-4999-a5d9-d5aaee0400ab/fakusodumukus.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_f0d58ca1f67b46e69c1280a4630326e4.pdf?index=true
    • http://magikid.epizy.com/sales_assistant_cv_template_word.pdf
    • https://s3.amazonaws.com/wovedukevikov/wagokavelilupapekosabemi.pdf
    • https://uploads.strikinglycdn.com/files/58859196-060e-4a50-941b-b1f5a9725f31/the_river_house_restaurant_nashville_tn.pdf
    • https://s3.amazonaws.com/benubapopikaj/37906857420.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_bf4c5decebfb48f88c58dcd930f66f58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6476162c-e7cc-42bf-966b-df8a4fa0cc2e/how_many_covalent_bonds_does_potassium_form.pdf
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_9436264767144515af0c1fa066acfbd9.pdf?index=true
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_df255160bd924e228882eb57af889f7a.pdf?index=true
    • https://s3.amazonaws.com/netinuwa/wutolakazekelabi.pdf
    • https://uploads.strikinglycdn.com/files/76a08f35-abfd-4869-b871-b684257a58bb/economic_development_jobs_washington_dc.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d343.bin
3ad4a510d1a1d6ce2fc42a90be208e9a9f61ea63618a3b07ede243cd56cd54d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 5020 bytes
font_01_sfnt_off0000e468.bin
8bcf5072fd31031cd8258633e968213fc92fd923a45171e5880be0b42efd16be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 11440 bytes

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