Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9993711d0c14402…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 22:10:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 070cecdf89fd7c77ec62a71f73702505 SHA-1: b355d393602567bbed8666b98a87a164180c8160 SHA-256: b9993711d0c144022d5d9176a559a1baf8178cfb95701134aaf98c2af3233925
186 Risk Score

Malware Insights

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

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 0.9989

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=aqa+sociology+a+level+revision+guide+pdf PDF link annotation
    • http://wasatosu.sportsontheweb.net/physiology_of_synapse.pdfIn PDF document text
    • http://myvenza.ru/86901268393ao0m1.pdfIn PDF document text
    • http://bachanalytics.com/how_much_does_graphic_designer_make_per_hourupctr.pdfIn PDF document text
    • http://instas.site/guzuxatijuzememiwou1hqf.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/fabubefuvalelupenu.pdfIn PDF document text
    • http://dwatches.site/trb_highway_capacity_manualdkruh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ac0e2187-690a-4098-a41c-f7af49343fdc/how_to_use_wrist_cuff_blood_pressure_monitor.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/razurakigujadowoxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11153149-4218-455f-ada0-b2cdaf8f073d/shimano_sm-ew_wu101_di2_wireless_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e535920-18f8-4c9a-8abb-f3c929be92f9/principle_of_social_contract_in_the_declaration_of_independence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef871412-600a-49a8-a84c-3d6f10b3245f/jokufujuxafi.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_3759bff2b575412386f39bdf0407cc63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a826661b-9bda-42c5-9732-3edda2f8c7a5/is_the_intruder_on_netflix_or_hulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7153007f-25e6-4989-8b57-907ba191ce6b/mecanica_contable_de_los_costos_estandar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/195eee08-97ca-4e2a-8320-d9d8ad161a88/zorosaxedevarotamufeve.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_0d8a06bc4c9447f0809f3c5f5c5abbc8.pdf?index=trueIn PDF document text
    • http://wokarodefi.onlinewebshop.net/programming_abstractions_in_c_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eb6580-0a27-4723-8028-14a6fb1af485/pentair_kreepy_krauly_prowler_820_robotic_corded_swimming_pool_cleaner.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_212cdd9d091347f2a9048bc054994c9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ligole/42662136213.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_cb62994e038a422383e46a67959a3f28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a54b1e-4af4-4cb0-b5d1-557b920f4806/81894496691.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/24049672389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e5132ac-a93a-45ee-8a44-f93aeb225363/kalowel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 5404 bytes
SHA-256: 4c7ace31c34b1ade6412d5b4a83bb1aa1cc284aa9abafd5cd50afe394ad3ab75
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 10924 bytes
SHA-256: bbf87dba1c7581d8db3ba4cc3a2e82281afcd77d6d5113202263d6eaed6fc3fe
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378