Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa4bde5896a27f3…

MALICIOUS

PDF

64.4 KB Created: 2021-04-24 12:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7617b3a0bf777c9762013f0e50b753fd SHA-1: 8b85f56b699847678e1db8469ae6652cd4c48261 SHA-256: 5aa4bde5896a27f30cf360d65db4a0c077060711c2b58ae4198ba483519bcd94
126 Risk Score

Malware Insights

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

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 0.9998

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=1993+mercury+xr6+150+parts PDF link annotation
    • http://vabuxobetarewo.22web.org/lujifo.pdfIn PDF document text
    • http://sukalolijijegiz.iblogger.org/48684378420.pdfIn PDF document text
    • https://bulejoge.weebly.com/uploads/1/3/0/7/130775594/xifafo.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/vixanakis.pdfIn PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/zabosubegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454988/normal_5fd61353e85ad.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/4398428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_6020530868c46.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/454488.pdfIn PDF document text
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/4518651.pdfIn PDF document text
    • http://puvememora.22web.org/fozifosedofuzisevijeraro.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/gilabusokiv_gemozegateneb_bejad.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/b1cc2edcae7470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giramipaso.epizy.com/vesicle_formation_clathrin.pdfIn PDF document text
    • http://timavutiziv.epizy.com/mediterranean_diet_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/18000027828.pdfIn PDF document text
    • http://kapodos.rf.gd/how_to_use_caron_cakes_yarn.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/majomax.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/94393289299.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/blue_jackets_all_time_scorers.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_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 5912 bytes
SHA-256: 1e221ff5bacb998ca0a3cfc89e352f1255fd3d8d6fbdc067230b97d5b5180458
font_01_sfnt_off0000d404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD404 9572 bytes
SHA-256: 1caca579cade55de0a873c4e9da674194d928054caa49ac70b9696e7693b4f70