Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88e3b2250dc61cc…

MALICIOUS

PDF

70.9 KB Created: 2021-02-28 18:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5ac95db5d3b5e61c05fd0940f78ea1b7 SHA-1: 9f8a911df32d51460e43336cf1d07dbf0f093453 SHA-256: b88e3b2250dc61cca63f4ff12452bc6ff80ccea0325abe607562162868b9bc25
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 0.9997

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://resalured.ru/123?utm_term=how+to+connect+bluetooth+device+to+philips+tv PDF link annotation
    • https://cdn.sqhk.co/setuboluraje/giaEZPe/kisifuwuziz.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/jgdmhjw/loaded_baked_potato_casserole_allrecipes.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/Tmmgg6B/59394716385.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/95681138661.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/resnick_halliday_krane_solutions_volume_2.pdfIn PDF document text
    • http://leomannapov.com/missingno_ghost_form_pokemon_card5uqor.pdfIn PDF document text
    • http://leledup.mypressonline.com/debiz.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/rojevo.pdfIn PDF document text
    • http://nicepics.xyz/reflexive_pronoun_examples_worksheets6tz21.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/mamiya_rb67_service_manual.pdfIn PDF document text
    • http://zuluguvo.iblogger.org/widiwirivitedixidil.pdfIn PDF document text
    • http://feelslike35.com/introduction_to_the_theory_of_computation_3rd_edition_download4egd1.pdfIn PDF document text
    • http://itslm.fun/61722006003ojhce.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/wexoteluwag/62384303715.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/remington_550-1_side_scope_mount.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/discuss_public_policy_making_process.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/55141383057.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/driver_booster_free_for_windows_10.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/66451320812.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/wurivoliregapuramu.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 5108 bytes
SHA-256: 8fa2e6b947a50210018bbf1b149203f871929de57d003dacd3df05af3141a8eb
font_01_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 10108 bytes
SHA-256: 5926bcaff2aab415f3bbd52a22b5e27f76560fc9a09b922823d8c027388b47da