Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7c6cf0fa2df14b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-28 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4fdfabafe16f44a486e150039e5e6de8 SHA-1: c81d2662a341c35ed0f6cc78e345c201a1f3540e SHA-256: fd7c6cf0fa2df14beb644d1cc882fec8430eb25faf47c4714a99b141d78f8a82
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 0.9998

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://dugedepap.ru/wix?keyword=mosby%2527s+review+for+the+ptcb+pdf PDF link annotation
    • http://sehq.xyz/the_little_red_hen_teaching_activitiesr7un3.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/gchcfZ7/34991220935.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/igpsijc/87357932944.pdfIn PDF document text
    • http://goodnatural.space/islanders_schedule_tonight37ix4.pdfIn PDF document text
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/5e6f93fd7.pdfIn PDF document text
    • http://fridgeservice.ru/what_weights_to_start_starting_strengthmhl47.pdfIn PDF document text
    • http://karma-911.com/217728802884fjcc.pdfIn PDF document text
    • http://kvadro63.ru/60241829178zxtyl.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/tibunanogowulefijimupabaxzmaao.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hf2Djii/big_east_men_s_basketball_tournament_2020.pdfIn PDF document text
    • https://wovikuzejujitij.weebly.com/uploads/1/3/4/5/134506660/virojukelojubogasave.pdfIn PDF document text
    • http://creditreportfast.info/how_to_calculate_half_life_physicsbb7ha.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ijOgcgi/kuzixenawabubitumesu.pdfIn PDF document text
    • http://epipog.com/que_se_necesita_para_viajar_en_avion_a_estados_unidosh6q7s.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/sazomo/kukixigojorud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c41be4a-1bb1-4c88-8918-9384e3b51b52/hp_p3015dn_printer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1e6490-3d0a-43c4-b38a-4c1514e8ecb6/behaviour_support_plan_template_victoria.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/47083826542.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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5436 bytes
SHA-256: 073712a84f4c9c7cb51024b3d193b22597fab4c6c7cf38996d7e9f3f4e520877
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 10292 bytes
SHA-256: 11a264c25b2fb7d5649f0446fc7e4ec31c8d5546d7ec3f984c17ebd08b54d45b