Malicious PDF — malware analysis report

Static analysis result for SHA-256 be99211fd0ebd7b9…

MALICIOUS

PDF

71.3 KB Created: 2021-05-03 03:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fc2eee38abab24b934c8638f27be335f SHA-1: 41541d1fa6e407248fa66ee82a01d125a302d7f2 SHA-256: be99211fd0ebd7b915f46f1a7aee8ab880687300340183771a826175105fe614
156 Risk Score

Malware Insights

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

The PDF contains a lure related to checking food stamp balances, directing the user to a suspicious URL. Heuristics indicate a PDF link farm and ML classification strongly suggest maliciousness. ClamAV also detected this as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=check+my+maryland+food+stamp+balance+online PDF link annotation
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/sikapekunobidazum.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/d75bb3bbc56.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/xurodefibijinuma.pdfIn PDF document text
    • http://nagafokom.iblogger.org/asymptotes_chapter.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/vebogotexaf/4th_grade_division_problems_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964d09ed-b56a-4191-b494-ad0a26c611e1/57079391017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d7c9f0-4e4d-4940-8ac8-c2da81409c1f/why_is_tiresias_important_in_antigone.pdfIn PDF document text
    • http://xizibosoj.epizy.com/sociology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/girdling_fruit_trees.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_aec431505fc2428e819fb0c966797307.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxunu/what_is_the_15_wings_of_fire_book.pdfIn PDF document text
    • http://pamubaj.epizy.com/65207503603.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_b9f9a753dfba40779bf0e030a29f4197.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/leributafa/google_form_pull_data_from_google_sheet.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_d624718621f74a98bd624a109d3d31da.pdf?index=trueIn PDF document text
    • https://4d354257-8314-43f4-994b-4737921b64e0.filesusr.com/ugd/3835dd_652d6c81e6ae464294505dcc381dbef8.pdf?index=trueIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_2ba3e13664f44440be4f011d538275fd.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_48215b95cf0e453382889c6deeaec48b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebea279-7dbb-4dc3-ac39-346c30e6f56f/goflex_home_login_forgot_password.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/58065380320.pdfIn PDF document text
    • http://vowaxuf.rf.gd/marine_accident_reporting_regulations.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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 5608 bytes
SHA-256: 90a869e250c9a0c4aadaabcc052ee2c57211ee16adfafd51224352a2fca5028c
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 11108 bytes
SHA-256: daea0f998f13e972270f5f42a038ad5617628592ad067268fbb714d1f4a5e0fa

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