Malicious PDF — malware analysis report

Static analysis result for SHA-256 400014d6586f4c46…

MALICIOUS

PDF

75.0 KB Created: 2021-03-12 04:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ad24d62324eb4a505c8484887cc64b6 SHA-1: a4f09ea68a98fde7d9484f6efda0df1d1d16c910 SHA-256: 400014d6586f4c465435f07c482b63aef56a1c7b820a0bec674f3c6a55d87262
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document body, though heavily obfuscated, contains text related to a '$16122 social security bonus', suggesting a lure. The presence of numerous external URIs, including one pointing to 'nipisod.ru', further supports the phishing vector. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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/strik?utm_term=what+is+%252416122+social+security+bonus PDF link annotation
    • http://nipokaxa.getenjoyment.net/xatonukedelivomun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_6029d64914982.pdfIn PDF document text
    • http://mukoxadetovewo.66ghz.com/76673631976.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/how_to_soothe_plantar_fasciitis_pain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602e0c4e0a70a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_5fdc3a3d9329b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_6033dca6063f2.pdfIn PDF document text
    • http://punejew.mygamesonline.org/what_is_16_personality_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5fe242c9d08a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ff29ebd2d364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_5fd74ad822e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_6014afb3371e2.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/36155072003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_60354f16979ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5ff6809cf17b3.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/tetufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufotef.rf.gd/fluke_771_replacement_clamp.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/50674984891.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/grounded_theory_research_question_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/cavernous_transformation_of_the_portal_vein_radio.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/56248844708.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/fire_fighting_robot_report.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/in_spite_despite_exercises.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/dubukobipajutavinasoke.pdfIn PDF document text
    • http://bapiwixobenilax.rf.gd/basics_of_microsoft_excel.pdfIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/rujelepaninafale.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_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5720 bytes
SHA-256: 729b8ea3352e3f8bada178abe7ee06394952deb2f95d8afd70cba3e729d72306
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10688 bytes
SHA-256: 3f8851c0622d8ce42f7218054fbc7954da5f182792b9a86303e6c27e2b717574

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