Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c5677bc247e120…

MALICIOUS

PDF

77.6 KB Created: 2021-04-22 01:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0e6fda1449c1bb893716798b24cccb84 SHA-1: 58d4b72fe3b0c63cdf819acb8d28193af95bc738 SHA-256: 31c5677bc247e1201c9bdade15096d8dfb6c395391e76ab82c16cd55ace62657
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=algebra+2+solving+absolute+value+equations+and+inequalities+worksheet+answer+key PDF link annotation
    • https://rafafusutur.weebly.com/uploads/1/3/4/8/134858683/pegiva_jevovawufe_vosarulufavosaf_laxezet.pdfIn PDF document text
    • https://kuzefezatuxiwa.weebly.com/uploads/1/3/4/8/134898449/594950.pdfIn PDF document text
    • https://kavosoxevab.weebly.com/uploads/1/3/0/8/130874108/2574df2c115c567.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/rocket_propulsion_elements_6th_edition.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/3fc85f.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/rexatuxenejug.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/spring_framework_book_download.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/astm_a36_chemical_composition.pdfIn PDF document text
    • http://jiliwurevefo.22web.org/toma_de_decisiones_bajo_certidumbre_incertidumbre_y_riesgo.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/jitimesolagun/hp_4630_printer_driver_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/rujavokupapumo.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/balunga_toka_song.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/chrysler_pt_cruiser_2002_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/89832249226.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/christian_devotional_songs_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/75279957637.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5792 bytes
SHA-256: ddbc39ed61d49f832a253168c6ef81942fc0d255ca7f9ceee4d6e46ee95ae8dc
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 11316 bytes
SHA-256: 069620a7c7b05818eb1a00320eebfb8dadd88bc51a67ba0a9a0bc4280ae0df67

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