Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b6953ed984a877…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 10:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ba2f01ba0786b990cc11c611221c7e27 SHA-1: 0db930b4c3be60a55b14f4e98649fb74bc78c694 SHA-256: 37b6953ed984a877ac79999aeadeebc387d25b02c7b70dddbe41446f3eb3b904
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting and employing link farm techniques, suggesting an attempt to distribute malware or phish for credentials. The document body, though heavily obfuscated, references 'dehydration synthesis gizmo answer key pdf', a common lure for educational or technical content.

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 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://botokaw.ru/wix?keyword=dehydration+synthesis+gizmo+answer+key+pdf PDF link annotation
    • http://jekenufakewe.mypressonline.com/the_making_of_the_west_4th_edition_volume_1.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/java_8_download_for_windows_vista_32_bitcud74.pdfIn PDF document text
    • http://rusherx.studio/tewenadeay4wl.pdfIn PDF document text
    • http://reestr.site/91727787357an3ac.pdfIn PDF document text
    • http://cadenalia.com/traxxas_tqi_transmitter_with_docking_basebenzx.pdfIn PDF document text
    • http://larixulefil.iblogger.org/86084158851.pdfIn PDF document text
    • http://netewe8.xyz/xfinity_stream_beta_not_working_error_500ndcn2.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/gfidggE/fonot.pdfIn PDF document text
    • http://servicesforsupport.com/549261444nnbop.pdfIn PDF document text
    • http://micrometer25bill.site/what_to_do_with_wildlife_biology_degreei1icx.pdfIn PDF document text
    • http://ditinunezaduta.iblogger.org/how_to_make_a_website_without_coding.pdfIn PDF document text
    • http://lidzadva.xyz/which_detergent_is_best_for_ifb_washing_machinej3sor.pdfIn PDF document text
    • http://tixshopclub.fun/how_to_be_a_successful_medical_laboratory_scientist_ukfvpib.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/Mticjdr/51869781889.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/hgbjhwr/aafes_ps5_pre_order.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/eyjdjgB/muvafekelowezigudajemizar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibipadesubamom.epizy.com/5v_zener_diode_datasheet.pdfIn PDF document text
    • http://wolifajutoxapas.rf.gd/how_often_to_change_transmission_fluid_2010_toyota_camry.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_off0000f237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF237 5728 bytes
SHA-256: 6fa116a341f145f24de76ff8cceacd387d0184e08688883fd963ee9f3ca50487
font_01_sfnt_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 10336 bytes
SHA-256: 8dc16e5cd4dd9df556f2626c4dd7c1bc6b8ef4a5f819bc3eb698ecaa6c921ac0

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