Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7b157e26693337…

MALICIOUS

PDF

78.0 KB Created: 2021-04-27 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8bc0fa999648cdef8070f9583882defb SHA-1: 0e2d39393704b61a6ca1cd7b89b9fee267698a1b SHA-256: da7b157e266933377a61cebd4162e93f6146a45aab9ca11774bf979370b75b09
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure are consistent with attempts to redirect users to malicious sites.

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://baarspo.ru/strik?utm_term=wansview+ncb541w+wifi+setup PDF link annotation
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/bc6828d.pdfIn PDF document text
    • https://sutovuwoti.weebly.com/uploads/1/3/0/9/130968995/danososeb-nefoma-lupunozaku-wejenur.pdfIn PDF document text
    • https://xolesozetenosox.weebly.com/uploads/1/3/1/0/131070434/af00c.pdfIn PDF document text
    • https://losuwasujiro.weebly.com/uploads/1/3/1/6/131637226/6613547.pdfIn PDF document text
    • https://netigobulon.weebly.com/uploads/1/3/4/0/134096742/piboxevisamajikoso.pdfIn PDF document text
    • http://lufoveferezudu.22web.org/16351275955.pdfIn PDF document text
    • https://duwaxitim.weebly.com/uploads/1/3/4/3/134312722/miziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodujuvutadaxam.epizy.com/69290405152.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_0bbc2d066f474960a3b3a5b87f17ad8c.pdf?index=trueIn PDF document text
    • http://tiwufuwivuvuf.epizy.com/mary_balogh_free_download.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_e014e23fe4e9417c9df335921c170c63.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_55d38e35982b4059b2e9b1c85ffb6775.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/6571240285.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/fesiwirikigabidesi.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/how_much_does_it_cost_to_rent_an_ice_cream_machine.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_c5b103d02f8643f596e27c609f51cd30.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_e307fa3cb9a74462b7944361f0ead725.pdf?index=trueIn 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_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 5448 bytes
SHA-256: 23f1e01f32f4ce85fd169a20fe427bb0a2d021c57f72b1de49e3b52976b8336b
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10832 bytes
SHA-256: 5e3c9c5ccd908d6cbbe0224de2fdb3f2f5b1d3bd22b878881104c65c4b87b562

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