Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd0be13b660b2a9…

MALICIOUS

PDF

68.4 KB Created: 2021-03-15 00:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3e0e2de4ffabcb270ad570985aadf918 SHA-1: 2fe63385acaef11b2f6207ab8b784edfe7f35da9 SHA-256: 4bd0be13b660b2a9298cf041cc8065661a09aaa08a321235c2acfcdcbe1b0553
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://zajinet.ru/wix?keyword=chapter+1+introduction+to+anatomy+and+physiology+study+guide+answers PDF link annotation
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/d0387.pdfIn PDF document text
    • http://boreluto.22web.org/sumafajuwejose.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/loxurapizudalavemageruf.pdfIn PDF document text
    • https://talebizipuvi.weebly.com/uploads/1/3/1/4/131483067/0e8e06a479026e9.pdfIn PDF document text
    • http://kimelaxuwivupa.iblogger.org/planck_s_quantum_theory.pdfIn PDF document text
    • http://tawexowupa.22web.org/how_to_re_sync_a_vizio_remote.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/the_lightning_thief_chapter_10_questions.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/e75d5631265.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/latutifemeramukenorodipox.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/potamotaz/will_there_be_an_odd_thomas_movie_sequel.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/scary_halloween_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/modern_processor_design_fundamentals_of_superscalar_processors_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/fundamental_analysis_course_by_ca_rachana_ranade.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/98315904156.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/90084796483.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/53666950695.pdfIn PDF document text
    • http://kivajujudupogij.epizy.com/boyle_s_law_worksheet_answers_cavalcade_publishing.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/mojowema.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/fogosaporegu.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_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 5640 bytes
SHA-256: 65a4d8782559998bdee670b2230d0e125fbacdc204cb3dcf08ad8ea012b57e86
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 9724 bytes
SHA-256: 786dcddb3382633b7d18831b9908ab7b44a349643c19a98125a01658a7c495c4

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