Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0806e03f9f4c54…

MALICIOUS

PDF

80.7 KB Created: 2021-05-08 02:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eceb9dfb259c1feb4494c5876cecb9c7 SHA-1: c39ba6e0157490104ab48629d3553dc3c16393c8 SHA-256: 5b0806e03f9f4c545d94fb695c4b143109bae10b68ca4c4b979deb2d671005aa
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=work+and+power+review+worksheet+answers PDF link annotation
    • http://judejoz.iblogger.org/mandated_reporter_definition_washington_state.pdfIn PDF document text
    • http://giocodigital.space/pizunakunitokefusogernal86.pdfIn PDF document text
    • https://cdn.sqhk.co/logenuzupug/Yjgihha/75564877139.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/jThhQid/microsoft_365_admin_center_forward_email.pdfIn PDF document text
    • http://vigastlens.xyz/is_curl_activator_good_for_natural_hairr5aee.pdfIn PDF document text
    • http://supozupewurak.22web.org/33516740671.pdfIn PDF document text
    • http://pomemaxevisuma.iblogger.org/is_the_chase_game_show_rigged.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/jIghoHo/money_maker_weed_grow.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/7gg4DWd/kapafirufeja.pdfIn PDF document text
    • http://bonifacy.site/36567212278rqd9y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff014004-1108-48cc-baff-c41525b95d24/petopisozusifebanokaxalu.pdfIn PDF document text
    • http://balepififeri.rf.gd/26929521707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c499d9-8557-476a-964f-aeccb02149e8/bulova_chronograph_blue_dial_mens_watch.pdfIn macro / runtime command snippet
    • https://uploads.strikinglycdn.com/files/32aaaf9e-421c-4de3-9269-869bb3c548cc/warrior_cats_manga_tigerstar_and_sasha.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/88833394629.pdfIn PDF document text
    • http://muwuxivikunef.rf.gd/journal_of_business_ethics_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/present_past_and_past_participle.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/albert_einstein_books_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/23352183564.pdfIn PDF document text
    • http://rojegasofibi.epizy.com/clean_and_clear_oil_absorbing_sheets_cvs.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_off0000fcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 5244 bytes
SHA-256: d1b59fb118a9167bdb40511ade7b67a88613bb5aadd57f8052cc0725a8890059
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 11060 bytes
SHA-256: 0a95b812bbc036b09fdb4f6d5a65d6ada215d62f6fb60016815dda6a004d494e

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