Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a9242073522b1c…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 02:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46a9b570dd1304c49c5868e9a5c54593 SHA-1: 95bd752a441eba20186baad012ef6f5bba1c67d5 SHA-256: 42a9242073522b1c4b2c63fe83f1c9cedf4eb923086dba4ae88efdfacfa86424
126 Risk Score

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://kuzutuzo.ru/wix?keyword=celestial+english+breakfast+tea+k+cups PDF link annotation
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/wafupowijobuk.pdfIn PDF document text
    • http://fastnoutservice.ru/discovery_channel_animal_planet_videosny2z7.pdfIn PDF document text
    • http://mebelrostov.ru/bajakq0nqh.pdfIn PDF document text
    • http://hargotel.xyz/63764395798n4qhu.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/tebebekupemevewujig.pdfIn PDF document text
    • http://meetplafond.xyz/321580862943odqs.pdfIn PDF document text
    • http://verifybadgesbusiness.com/serubelegujopewawabd0kq.pdfIn PDF document text
    • http://iciapp.xyz/marlin_336_lever_action_30-30_reviewi8iz9.pdfIn PDF document text
    • http://brumbum2.xyz/zelda_ocarina_of_time_n64_walkthroughusp8t.pdfIn PDF document text
    • http://titoto.xyz/73801586900skfnw.pdfIn PDF document text
    • http://gamedv.design/vuwuzisepawiribikarabamw474v.pdfIn PDF document text
    • http://circleshtang.xyz/where_does_like_water_for_chocolate_take_placeeeuf7.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/zirapi_tekenuwilomagi.pdfIn PDF document text
    • http://logoped-samara.ru/grammar_in_use_pre_intermediatevfdix.pdfIn PDF document text
    • http://tovarzone.ru/management_assertions_balance_sheet_income_statementv04b0.pdfIn PDF document text
    • http://study-english-02.space/king_james_bible_tagalog_versionvudfa.pdfIn PDF document text
    • http://antileqphh.site/how_to_rig_a_fishing_pole_for_troutaoycq.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/tuxutedi/bombay_dyeing_double_bed_sheets_online.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/whatever_happened_to_the_caped_crusader_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/adtran_netvanta_838_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/bitsat_2020_application_form_fee.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/pfms_full_form_in_school.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_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 5388 bytes
SHA-256: 3a770f7b96ed9eef018b0388c8e7294e7cf2b16065c63a5d46cc6d8f10309dc4
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 10860 bytes
SHA-256: 1ee05d3bc9ac98c5240499d5aef21b091cfd51180e2aba6de42a837b0dfffcea

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