Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1eb85f4d2b1177…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 03:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 014f51c82a106fd7005e209814935634 SHA-1: e547f2e0423cbd89ccfc09f21ab5728ce2d8c1f6 SHA-256: bf1eb85f4d2b1177536d3c4fcb5c1169404ea456620b129a773e690bf810f47e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript execution within PDFs to facilitate redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mezovuduw.ru/123?utm_term=if+date+is+null+crystal+reports PDF link annotation
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/6196619.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/rojaxugozoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407301/normal_60442ed0eaf52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474191/normal_5fd04624e3801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60375aa9e0d9a.pdfIn PDF document text
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/retawogerega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409992/normal_5fded75d27eff.pdfIn PDF document text
    • https://vilomaranetuxer.weebly.com/uploads/1/3/4/5/134502128/tizox_fipugopili.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_601fcff4011ba.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/2261489.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/ranugumasiba-rovejowovevufuz-zazebawujabor-lajirekaroburo.pdfIn PDF document text
    • https://zegaturivelegob.weebly.com/uploads/1/3/1/4/131437779/suxaguzelex-sojitogabeba-kuwumeni-rasekadufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428033/normal_6002713b6d237.pdfIn PDF document text
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/911604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd66097c4aef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_60396a99a520f.pdfIn PDF document text
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/nebiduge_nixesaga_menuvuxagiwaruz_xoxuwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5feef0aa8ed8a.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/1988b5dd-068b-4240-85ae-807965a7b314/jipunud.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_3244198fcd614bee962dd2f558293285.pdf?index=trueIn PDF document text
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_b6e2080a578f4e5aa79f2d75aee3a304.pdf?index=trueIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_9bdb63457da24d6a8a052662b82a3b7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea2deff-4068-45f3-a618-8f47793fd794/the_bell_jar_quotes_depression.pdfIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_3e4e4163946740beb9135a8ba2c50a1b.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_92e068aea0eb40409c32f5b8012dcd2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d207c72-e8b2-4cad-b6cf-4dd40c003885/teravidaxediwuru.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_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5188 bytes
SHA-256: 25f06fbcec20ffe14269f170ecc187f43f6138685df84662ac7f9e6602c1011c
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 11564 bytes
SHA-256: befe45b7a8ae0b253f7e10b3aa4ba4ad7a96e82ad7d2cd6a290171b4860f4d71

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