Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dde921e2b859ae…

MALICIOUS

PDF

68.9 KB Created: 2021-06-03 03:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f84f6c1b7d0eca6fbc8d7ed20ebf0e84 SHA-1: 2932d9cc124bb547b988207162900379be6f2a0c SHA-256: 78dde921e2b859aef73fef546cc27cf2003b006213521f82927f66c2096675c9
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://crophysi.ru/123?utm_term=binary+file+to+pdf+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406473/normal_605d9db2583fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_602468d3c8ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_605a0c37d854f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466411/normal_5fcddc7cba280.pdfIn PDF document text
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/2367067.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379606/normal_60b750f004f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_6069e25aedd48.pdfIn PDF document text
    • https://bisenerujopok.weebly.com/uploads/1/3/4/8/134898299/wijexupir.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/9952359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_60488c42f15a9.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/nimuxikuwabem.pdfIn PDF document text
    • https://lebilelumebik.weebly.com/uploads/1/3/1/6/131636833/xixux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486215/normal_5feecbc9f4116.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/5f72fc9d-72cb-4fc2-8174-ee78f4eead66/how_do_i_write_cancellation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4e9c7e-e215-4fa9-8ba1-0718bc3a7e2d/51391992875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d56878-12e5-441a-a6c6-4ff2c3834625/ps_vita_pch-2001_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c0011c-91e4-4165-a183-15c1fa52a564/introduction_to_psychology_by_morgan_and_king_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb6bb38-0343-44ed-a75f-0df7816e9c0f/parrot_mki9000_bluetooth_car_kit_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ed6f4a-dd90-4b47-92f7-dd92bc9a86ae/rockola_jukebox_for_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e759313-9c29-4bfc-ac6f-5ae4ab67c503/futebol_agora_2.0_apk_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128e9227-a107-4282-9bd5-8946fb071b6d/the_company_of_wolves_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b953e616-bbe7-4a56-a51d-d2016f1bab5a/because_beatles_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb27f7bb-fd81-4759-b4eb-dd9bfcda93ea/que_es_un_manual_de_funciones_y_procedimientos_en_una_empresa.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_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 5008 bytes
SHA-256: 5922b50079bd9e6c101e0f5515b63b73660f131843a460278f7fb8ba7298f930
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10196 bytes
SHA-256: 306fc510905b5d10d78599e21a2e3d3e82fb1704a45f539009a7d2e39b88e02a