Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb015fdd898b434…

MALICIOUS

PDF

73.5 KB Created: 2021-09-09 14:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 623620c9e6b7326d0dca2ada86f1f9b0 SHA-1: e1cf2a63221904911220b73993aa11aac14cada8 SHA-256: edb015fdd898b43433b9431f206ea83dce3592420d574db8c8f4d502c2999616
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.gamylai.vn/uploads/files/jamatiletuxaju.pdf In PDF document text
    • http://thingsantiquesla.com/userfiles/files/xawalijipananufut.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/lorurekapumadubixuxezawe.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/gabakuzosoderovijamine.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/60662783209.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/dotatokaxabezope.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/nirukajevilibo.pdfIn PDF document text
    • http://boldogelet.hu/media/kexoxiwebudalamubapirogu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wumowuvutuli.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/jigixi.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tetabiriri.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613834420c2e7---83410715756.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/80302092778.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/xesaxobivamuxo.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/81888839978.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/31895869988.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/4743480233.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/94880775329.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lufenuxiwaxadavofatida.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613317a35c007---71915617954.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1768978475612f94bdc5c50.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133252e1f326---82578347454.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/vofasopusuluwoxeratoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=app+ko+hack+karne+wala+appPDF 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_off0000bbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD4 17676 bytes
SHA-256: 4304b9678acd381474a3e69092359a417b1cc8a0915e6517823199f485ad74e6
font_01_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10272 bytes
SHA-256: 2525dca75cab4db1a31e56a1943696dcdd32641524ac21617b4f888bfe06f264
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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