Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f144e8dc873768…

MALICIOUS

PDF

87.3 KB Created: 2020-11-21 20:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 594919900bf91efd1a34a36b80f3b814 SHA-1: ee9ba1f1cb0d3cbe637392de843a4034c7c8edfa SHA-256: 05f144e8dc8737682858534cc718d069236f07b04b0d9a96975509e0bc612141
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or redirection mechanism. The document body, though truncated and obfuscated, hints at 'employee attendance sheet templates' as a lure, combined with metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://traffnew.ru/aws?utm_term=employee+attendance+sheet+templates PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8858e05e544.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/34861edfbb84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5f98d34f5a13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f9199c82e639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5f9cc4fa2008e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5fb29fff26fc3.pdfIn PDF document text
    • https://goraworozegisu.weebly.com/uploads/1/3/4/3/134324811/kopajizup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fa5bb70619ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5f990d0ae757d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukutud/futedibotux.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/quality_management_system_manual_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/question_30_impossible_quiz_2.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/cypress_creek_renewables_lawsuit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8855349e-d218-42b3-bba4-4a839b31c0dc/pillars_of_eternity_official_game_guide.pdf.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/kolefemajomesow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 5016 bytes
SHA-256: 95f7b761b8e2419fc8a7724052905c15439f008a1654cd72908905f69693bb02
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 1596 bytes
SHA-256: a6380d476d870b736758e1e7e8de8e2045843b1517103fe5f90e8bf683aab298
font_02_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 10084 bytes
SHA-256: 571e075430f91b44d52c2902eef92525e9908c4360ac10f5d1335aa0856e7393
font_03_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b
font_04_sfnt_off000140bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140BC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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