Malicious PDF — malware analysis report

Static analysis result for SHA-256 191c9a3023687f47…

MALICIOUS

PDF

70.1 KB Created: 2021-10-08 22:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9df48f325824d205bc2278f23d44bd0 SHA-1: c6a9524eae776e898868ce55e1e477d6ef73dc31 SHA-256: 191c9a3023687f47f7cb6ec0b3dae906cb753a924e0660140b81ae27bebef30c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://kcpsystem.com/userData/board/file/25457403339.pdf In PDF document text
    • http://patroha.hu/file/bamared.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/guxajurovejetafer.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/41529498604.pdfIn PDF document text
    • https://wittnebel.dk/file/pogitezakak.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56733603091.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/5803193218.pdfIn PDF document text
    • http://mdtrend.hu/files/file/50842000047.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/887742387.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58415771847.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/waxuwefamanelasune.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b26c1945e7---nidodopuvumomaroso.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/7845033472.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/69965430789.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/67009986609.pdfIn PDF document text
    • http://cwesp.biz/upload/file/nozebubuxijiva.pdfIn PDF document text
    • https://activepymes.com/pub/file/mupominunorajevalofug.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/ritumewejafewize.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/18684032839.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155fdeaa24c0---sasozaxisebinukigata.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/mavufub.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/10/file/202110010144252304.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/9806386451.pdfIn PDF document text
    • http://dc-a50e0b1dcb2e.breakthrough-nutrition.com/userfiles/files/damiribudeles.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/wuzuzufikazedawines.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=shellac+based+wax+on+applesPDF link annotation
    • 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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 10724 bytes
SHA-256: 96b297a8887116fafe36e99bad49ee834b1d30a65cbf32853243b190e27b7334
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 15368 bytes
SHA-256: f79e9e808c0d81034df4b521e7fedc74e11e36cb67b1ba1a574835570f2c2975

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