Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1214e1b45dd01d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 21:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7116b59d099bb67b50d482f713c7f2b SHA-1: 60dff8d07c986fe1fbdaba8fc4515363dfb6157f SHA-256: 4d1214e1b45dd01dbdfed03365b5741f7033c1961dcf0a02abc5c6ddd10717eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to disposable or low-reputation domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=mms+group+enhanced+group+broadcast PDF link annotation
    • http://westhollywood.ilovepokebar.com/uploads/files/76654254431.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/69566834142.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/wovonadepijudoza.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tolavagaxekegi.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/lowakeletomo.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/dasudatetunaratoboz.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/situzavedakoze.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/17640502715.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/14259345041.pdfIn PDF document text
    • https://andrejc.si/files/file/gotilegewatitoladegibomaj.pdfIn PDF document text
    • https://triosms.com/userfiles/file/fepudowufemomatotowem.pdfIn PDF document text
    • http://chinahongji.com/d/files/69771252482.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/femofosipijo.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ziliwife.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/gefoxawexotumopife.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613a773b184be---17634293507.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/24871678023.pdfIn PDF document text
    • http://devveb.net/userfiles/file/defipafiwisapidefenufor.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vilomuzesixususadi.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/73989266431.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/ziwuxikagexamijafazo.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gudiwumogireravanegum.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210914012905.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/36175785889.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/67392840941.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16168 bytes
SHA-256: b85f322acad6bdf4236d9e5ba391563cea44d7dfde7925ed44314a332d13d42e
font_02_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 11056 bytes
SHA-256: 152892c31a1458f3f164381cce2f39fc31e284622a7bf106ba321bec0e18f7e8

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