Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bad0b482dd62ab…

MALICIOUS

PDF

82.5 KB Created: 2021-04-04 17:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff5aa0995b108330f5ffa4c4e9a77263 SHA-1: d594d7fdd60f12e96bbfbb49b46e9cd7b7937dc9 SHA-256: f8bad0b482dd62abee4066160d7e8a9d83b9cac92226ddf5fe78c784a675999a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are SEO-themed and point to PDF documents, suggesting a link farm or phishing attempt. The primary malicious URL identified is `https://jottigo.ru/strik?utm_term=what+does+central+idea+mean+in+language+arts`, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=what+does+central+idea+mean+in+language+arts PDF link annotation
    • http://kajejib.medianewsonline.com/microsoft_azure_sql_data_warehouse_a_complete_guide.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/56335061762.pdfIn PDF document text
    • https://kokozorakozuwel.weebly.com/uploads/1/3/0/7/130775651/mosot-lekibe-zuranura.pdfIn PDF document text
    • https://ribapapa.weebly.com/uploads/1/3/4/4/134479292/9381078.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/dibaxabuzaluluwakofe.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/008b4545.pdfIn PDF document text
    • https://repavubujog.weebly.com/uploads/1/3/4/4/134486674/filizo-gafexobabik-lijikexi-gufexatukagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/3rd_grade_math_staar_test_answers_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60402ea4-8457-427b-b80b-0f475515dd9a/83484592534.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/what_is_number_theory_in_discrete_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fd2298-44ee-4d13-a542-cbe2ac70951e/63314731964.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/netamudas.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/citroen_c3_tendance_2015_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7306124-7e83-414a-b2b1-4ae8c9848d78/41407928105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70708e36-aa88-4615-b32d-a4ec687f2dd0/jiwuxuxoriputap.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/sort_worksheets_in_alphabetical_order_excel_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/impulse_control_worksheets_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/how_to_take_apart_shark_navigator.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/39767490203.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/84620457735.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/29486684810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f013995-fc9c-438a-a54b-76bbefb43806/what_is_corpuscular_theory.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_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 5364 bytes
SHA-256: 9154abdd1b2cd617c620ecae6b897058d3f5e9416455efa27c31b5d24be02a21
font_01_sfnt_off000115c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C4 11512 bytes
SHA-256: 54b6743a300caf9df3b36b421bf96d5eaf4d8897b8d580bc0f71bf295fec4cf2

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