Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a4b02572795369…

MALICIOUS

PDF

77.5 KB Created: 2021-06-11 01:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a01973e7324b20b9687def4b53c70037 SHA-1: 0985405bd5cd0b6aada15e8e8e3a232ddc0b3f98 SHA-256: 95a4b025727953692afbb872b8fdaa0f9018160bc800a0d9aefadfcd26ed5420
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, suggesting a malicious intent to direct users to potentially harmful websites. The presence of the URL 'https://cructi.ru/pbw?utm_term=icloud+free+unlock+online' indicates a likely phishing or scam lure related to iCloud services. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://cructi.ru/pbw?utm_term=icloud+free+unlock+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503214/normal_603a201b492f1.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/fibelubevulazigiwofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6050f7fb1b0a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388827/normal_6018855e8d51c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_606e6fd1d098e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_60bb2554a1c23.pdfIn PDF document text
    • https://mugokirupela.weebly.com/uploads/1/3/2/6/132681863/ea535.pdfIn PDF document text
    • https://xivexibajewubud.weebly.com/uploads/1/3/1/0/131069970/latifotowuda-ropunexal-xilobu-dopag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_6050f5cc2a8e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_602afb764507a.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/1017cdcc-68f0-40b5-a216-6073fc752376/85361274939.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/w/file/fetch/144802815/19172791770.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/145086168/livujameluxopuf.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144980220/pezilarij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6aa8db-61ee-46f0-ad3e-a05208b241eb/scary_stories_to_tell_in_the_dark_full_movie_free_download.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144489282/30897327632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2367b4d1-dded-4f46-83e9-35f571c12483/10004201938.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/kmspico_microsoft_office_2016.pdfIn PDF document text
    • http://juvozato.pbworks.com/w/file/fetch/144953193/arithmetic_sequence_finding_the_nth_term_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501d15d5-4802-4fc2-b2b2-551e6a1b1661/94845681464.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/f/81096962570.pdfIn PDF document text
    • http://murusefikuk.pbworks.com/f/40443833910.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/w/file/fetch/144628599/resumen_pelicula_escritores_de_la_libertad_yahoo.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_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 4432 bytes
SHA-256: d4cc0700838d0ee46ce86b132522b402c6335e0faaa93f5fe2b111600f2c2ae8
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10796 bytes
SHA-256: f754014f946227f2bb82d3a1f0e47ce909fcddaa92827104ca61f9f8b2e4684f
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2