Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0230ed0c0cf4418…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 02:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb26e39b06e677c9a616feba7d869cdf SHA-1: eab271ba13165099ea2d0f4e53ff7458c6cb33a8 SHA-256: f0230ed0c0cf4418bab769c46c9d020f4413a185fa36751b213cffa12b42301c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. The embedded URLs and the heuristic firings suggest the primary goal is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=navy+blue+t+shirt+dresses PDF link annotation
    • https://ferijivoko.weebly.com/uploads/1/3/5/3/135327637/zuwekunuwofuk.pdfIn PDF document text
    • https://fuxusololozo.weebly.com/uploads/1/3/1/3/131380606/kejanonub_povesatetaterar_gugatefurebap.pdfIn PDF document text
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/6321088.pdfIn PDF document text
    • https://fejufawos.weebly.com/uploads/1/3/4/3/134328201/3067471.pdfIn PDF document text
    • http://luminar3-download.xyz/fegejixivegugidst3qp.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/sisutasa-japigizipuvul.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/suzy_welch_10_10_10_freexighg.pdfIn PDF document text
    • https://nepikazot.weebly.com/uploads/1/3/4/5/134526085/pidabalu.pdfIn PDF document text
    • http://opticsystem.website/limits_worksheet_3enz1m.pdfIn PDF document text
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/2414012.pdfIn PDF document text
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/6739652.pdfIn PDF document text
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/sixaxu.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/9157976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_736f2f835d7f48059192d8637e90f7e1.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_3f0ab821f53f4cd6aae908521192a7de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/block_format_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/72126354118.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/mokegigerawexolizi.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/dotnet_technical_manager_interview_questions_and_answers.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_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 5184 bytes
SHA-256: 6d62bf1108662c935ca2a2e73026cdc9876ea3d00ae4062ee7f86484976a3a6a
font_01_sfnt_off00010416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10416 11116 bytes
SHA-256: 6ce903bd8877267d6a52ba30c25df8118c25dc55f82cc80ae4fab96e57ab98e9

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