Malicious PDF — malware analysis report

Static analysis result for SHA-256 095c5a92e8b17d4c…

MALICIOUS

PDF

77.6 KB Created: 2021-05-30 17:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cea42fe66b7f2d2a0b3f2650f82bf83b SHA-1: 70e066f27273ceb253b2d10eb77531b12c7d9953 SHA-256: 095c5a92e8b17d4cc853be8aa2fec9f00774edcf7a68c68eed9e28c37c969a36
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 0.9996

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://lozipotod.ru/strik?utm_term=how+to+top+up+landis+gyr+e470 PDF link annotation
    • https://kobijetiva.weebly.com/uploads/1/3/4/3/134322382/zazewedojer.pdfIn PDF document text
    • https://xotinibawilufo.weebly.com/uploads/1/3/1/4/131437660/2434636.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/wenasizuv_gipifiparam_jusirejelopamud_lolozaw.pdfIn PDF document text
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/wojidojede_nalewev_rorumesemeg_wusopakododef.pdfIn PDF document text
    • https://naxonefewu.weebly.com/uploads/1/3/5/9/135961026/goviwo-ruvuwas-jevidupezapus-wigikefi.pdfIn PDF document text
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/7683908.pdfIn PDF document text
    • https://newowuwaw.weebly.com/uploads/1/3/4/6/134634034/e378b0a50a6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_603548f024f56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478422/normal_604949b1b52b2.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/1655945.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/d6c4b499.pdfIn PDF document text
    • https://dopakujovifoba.weebly.com/uploads/1/3/0/7/130739833/9d80e.pdfIn PDF document text
    • https://tawuzipufuk.weebly.com/uploads/1/3/4/7/134707118/palenezusod.pdfIn PDF document text
    • https://gerulelib.weebly.com/uploads/1/3/0/9/130969354/3980065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e062389a-3ba4-413a-964d-948688bc4216/international_human_resource_management_dowling_7th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81073d8-8876-4233-8d44-16baad3dd878/how_to_get_a_free_bus_pass_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e53403-1f6d-4c45-8bae-47e3f8b41ef5/are_chinese_sky_lanterns_legal_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41dbb0d-ea9a-4f9c-9fb4-fa63d472ba16/network_cable_color_code_cat6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2e0b76-dd75-4ef3-a888-8229c3ff6202/6471187069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8922a309-1497-4c8c-84d2-d8d91c6bc249/boss_ve_20_manual_portugues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d47c113-d9f2-4ddd-84b3-94e7efa4510f/how_to_draw_anime_hairstyles_step_by_step.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_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 5592 bytes
SHA-256: be98a6108787ce82c0923e4b02d070c6c396b58af0857dd35a6ea86f61851f79
font_01_sfnt_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 10828 bytes
SHA-256: f338ed5b98fe902598402f4f1f765c5eaf76d15ff5bb598a71ac340e9b3bc90a