Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d6fb913c097cd6…

MALICIOUS

PDF

79.4 KB Created: 2021-05-03 10:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f73fc4aa9afdc45900508a8057b23e47 SHA-1: 86cd53e668e901ef21a8f1b868918f3638fde8d5 SHA-256: 75d6fb913c097cd60c50bb66ce267d550322ffc28acd5b214cab25eec6249931
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=do+my+duty+to+god+and+my+country PDF link annotation
    • http://wersita.space/circunferncia_da_cintura_e_risco_cardiovascularj7dzs.pdfIn PDF document text
    • http://shoop-fm.ru/imagenet_dataset_size8o4f5.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/c0hgjdj/58261030995.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/Hgcgcu6/bubble_shooter_extreme_level_225.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzagile/bjb7ja7/saver_reposter_for_instagram_apk.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/elder_scrolls_arena_world_map.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/kgcjeQD/carson_city_dmv_vin_inspection.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/YhiNohf/46444073171.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/jchgFie/18293137815.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/ihwsidw/39922326390.pdfIn PDF document text
    • https://wenewemegidipep.weebly.com/uploads/1/3/4/6/134679414/defifosagokoxid-tametovuzo-zifefukuvomokub-kolidifi.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/983685f3d7b93.pdfIn PDF document text
    • http://comp-arenda.site/39354272111vsv56.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/geLnbie/paneretof.pdfIn PDF document text
    • https://fotavimapuwe.weebly.com/uploads/1/3/2/8/132816041/8145584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_e31cc60cdd9d499cb7024423900752a2.pdf?index=trueIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_93480fbc9cae45bf83be9f42914bc23c.pdf?index=trueIn PDF document text
    • http://wenulusevikofa.myartsonline.com/zepuraferonusesunifuze.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/81016965180.pdfIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_7833a41c3d53402b8d09a95554671b57.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_52aeb7b89fec466b855351f39b020afc.pdf?index=trueIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_4f6b2b4d8cf84a0b8f01fc74fe353b40.pdf?index=trueIn PDF document text
    • http://gevejonitu.onlinewebshop.net/55926381980.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/how_to_use_google_translate_offline_iphone.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_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 5148 bytes
SHA-256: be5ed1aabdb6203e836c04c6a9a10da4c6001f1e0a3899722984d117a64f56e9
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10672 bytes
SHA-256: 3b0050f315c14e298d1cd0e45664027a6870e203dacd9c7360a8f7e9f84e142c