Malicious PDF — malware analysis report

Static analysis result for SHA-256 f165386a697b1052…

MALICIOUS

PDF

103.3 KB Created: 2021-03-14 10:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 510a9b689752ea8ee71d3f44fcd2da62 SHA-1: ac5379e8984aab3bd838e03f73b411d40ee69235 SHA-256: f165386a697b105246978224b63fefc174c975d3cf80562802fc937e7a83c832
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The primary URL, 'https://leonvi.ru/award?keyword=exception+handling+in+pl+sql+pdf', is likely part of this scheme to attract traffic through search engine optimization.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=exception+handling+in+pl+sql+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fe5449b88e03.pdfIn PDF document text
    • http://webomiwizux.22web.org/the_all_pervading_melodious_drumbeat_the_life_of_ra_lotsawa.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/eriksons_stages_of_development_scholarly_articles.pdfIn PDF document text
    • http://mateguwokalidub.getenjoyment.net/ponunex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_600bf12cb6e47.pdfIn PDF document text
    • http://lexusesadedebaz.22web.org/godigamonapukemixi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc658ba5-d800-450d-a0d4-7ebb2c111ebc/wetikura.pdfIn PDF document text
    • http://zunerewema.epizy.com/3823386230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edeedcc6-926f-4c59-aac2-343f0f936623/jenkins_pipeline_.net_framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8abb0da-efcc-47ca-8bc1-632c80e51f70/harmony_of_the_gospels_chart.pdfIn PDF document text
    • http://godutiliwaganos.rf.gd/12_angry_men_book.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_2d37fc2e60934da98e8dbd5c8ba0880b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa4b5fe-c11b-4590-94c2-a86b8612b5f0/how_do_i_know_my_star_sign.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/barron_s_ielts_word_list.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_65580873913e46eb9ea58c21765e8892.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/834d1a3d-a518-4724-a049-0ea3f276e73d/26468428748.pdfIn PDF document text
    • http://fututajadijet.epizy.com/coca_cola_company_annual_report_2019.pdfIn PDF document text
    • http://sijurajogo.epizy.com/35182098186.pdfIn PDF document text
    • http://mobisojew.epizy.com/genetically_modified_food_benefits_and_risks_answers.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_66ceaea432734bd0b238c8734718aeb2.pdf?index=trueIn PDF document text
    • http://ropawowotog.epizy.com/psychology_textbook_online_myers.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_fc5e89248ed54bf39b606fc810ceb16f.pdf?index=trueIn PDF document text
    • http://nozuwodapa.epizy.com/bilge_pump_manual_switch.pdfIn PDF document text
    • http://jabujiwotase.epizy.com/xamunaxuzolijupoxolulebef.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_off000155b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 5472 bytes
SHA-256: 3585aa668d3a604a52b562bb9454d1a2cfa1fb7e681b25006fcbd3884bff6356
font_01_sfnt_off0001685c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685C 11296 bytes
SHA-256: 0358c53c32399e2ea4a100e9cdf01d77801a9e1fca9e150df1feb1674225deca

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