Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f17e62ce712b86…

MALICIOUS

PDF

81.8 KB Created: 2021-03-23 19:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41bf00dbe76531c4084dd8b21a5337f5 SHA-1: 2027161ae885aa94d684f6bec918fb11f97e72da SHA-256: 40f17e62ce712b86e9a3efc27774f737ecdddb6bad1243959fdec0c7bc1fbf40
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a malicious intent. The presence of embedded URLs and the ML classifier's high confidence score point towards a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vilenefex.ru/123?utm_term=caa+thomas+cook+claims+form
    • https://cdn-cms.f-static.net/uploads/4457279/normal_601aae27234f1.pdf
    • https://gukodelimipexi.weebly.com/uploads/1/3/4/4/134495789/0bdd4.pdf
    • https://cdn-cms.f-static.net/uploads/4369664/normal_601dfd3773df0.pdf
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5ff6594ae1a31.pdf
    • http://zoneeuro.pro/caterpillar_v50d_forklift_parts_manualjy80o.pdf
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/6077323.pdf
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/5094322.pdf
    • https://cdn-cms.f-static.net/uploads/4372737/normal_60414be9c31f1.pdf
    • http://profapp.pro/38080552444rkwb8.pdf
    • https://cdn-cms.f-static.net/uploads/4369187/normal_601f7e68b91e4.pdf
    • http://parkji5x.xyz/zepipijimk.pdf
    • http://xemizawufogutuf.scienceontheweb.net/bosch_300_series_dryer_symbols.pdf
    • http://rimka.xyz/xexegixezogewp1x7w.pdf
    • https://cdn-cms.f-static.net/uploads/4454673/normal_60204acb4e849.pdf
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fe256a28a7f9.pdf
    • http://gufutaca6.xyz/70485773341shm1p.pdf
    • https://static.s123-cdn-static.com/uploads/4494436/normal_5fefa4d93698c.pdf
    • https://menuvinowit.weebly.com/uploads/1/3/5/3/135320060/3607511.pdf
    • https://cdn-cms.f-static.net/uploads/4478927/normal_60258a6a673cd.pdf
    • http://fopokigife.mywebcommunity.org/15263887143.pdf
    • http://rasazajafatirek.mypressonline.com/kaziwezazekun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1be0bea6-20db-42d5-af0d-e456b2470e2c/how_to_update_netflix_on_dish_hopper.pdf
    • https://uploads.strikinglycdn.com/files/442165ab-9038-4bcd-917d-ef74a9e9ca27/22426480135.pdf
    • http://noroved.myartsonline.com/mackie_dl32r_manual_espaol.pdf
    • http://duvodix.myartsonline.com/28699152707.pdf
    • https://uploads.strikinglycdn.com/files/003ad417-e531-4e0a-887c-3a3eb6825599/is_the_drivers_knowledge_test_hard.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bc.bin
97a3598e996a4197c8f652bc5d9fabd6d8ed473a0030007fbf902c2c04a44dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 4772 bytes
font_01_sfnt_off000106e5.bin
82ceea737c1d81b5ad03923dfd63b22a46d4944f97a376deea8f0f10c9afa944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 10532 bytes
font_02_sfnt_off00012af3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 4324 bytes

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