Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83843534b451edb…

MALICIOUS

PDF

74.4 KB Created: 2021-03-24 22:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8b4130dbb087ee12681faadbc257b66 SHA-1: 53044699877973e8bcd0884d40e7699cf8e416d5 SHA-256: a83843534b451edb9b24b259f3232aeefe6b539ec51e008266d54737b8b12ebd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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 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/strik?utm_term=consejo+de+participacion+social+2020 PDF link annotation
    • http://donutota.iblogger.org/zixokikarunamutewes.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/dorothy_must_die_series_danielle_paige.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/60698619956.pdfIn PDF document text
    • http://wewedaz.iblogger.org/autocad_lt_2015_installer.pdfIn PDF document text
    • http://zonitupupafof.sportsontheweb.net/goxogiluliriradamumewowif.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/8995815754.pdfIn PDF document text
    • http://vofufime.mypressonline.com/ladixeximagaw.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/77087867738.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/how_to_bypass_icloud_activation_lock_for_free_on_ipad.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/tujekobegubona.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/kimafozesukusofefo.pdfIn PDF document text
    • http://wopizup.mypressonline.com/zamajife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovafis.rf.gd/ignou_mca_solved_assignment_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8e56849-2b75-469b-84e9-27af17df62bc/boy_in_the_striped_pajamas_book_summary_by_chapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b231b1-b7bd-43f5-99be-e25aef3b62ff/17573047868.pdfIn PDF document text
    • http://suvugadozomamu.rf.gd/automotive_lamp_replacement_guide.pdfIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/nepuzibafeziwamanefig.pdfIn PDF document text
    • http://xuwugufufokiti.epizy.com/ethical_dilemmas_in_social_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45814405-8d43-4032-b4a7-a64a087df49f/xatijiweked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5992565-6696-439c-90a5-a8613874dd9a/94708809663.pdfIn PDF document text
    • http://kaveled.epizy.com/6562394729.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_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5320 bytes
SHA-256: 147cea8e2ba2df51286def13850a9f72b38e64b944cde29e4b79cb120fc7fc6b
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 11352 bytes
SHA-256: 830d73a1e60e7ac9b5e38ecae292e8652bb906aba352a6f49b0bc511d99dd648

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