Malicious PDF — malware analysis report

Static analysis result for SHA-256 55adf213e90b2811…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 19:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b585ef43c3119f1f289bc78a3f7956b SHA-1: 7e635e8608d26ea38a39d860f0bb60fe248fb66d SHA-256: 55adf213e90b281111c267ab64f8799ebccdb19f716db8dcb7ec1f90f27cdcf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious document delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://marikakozmetika.hu/editor_up/tirerozigoxije.pdf In PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xusulevawudijobegazowofik.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb057e6786---befulupivavomej.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/zekagan.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/midanutewuboxujomiwadeg.pdfIn PDF document text
    • http://infunplastic.com/d/files/6909309718.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/fiviwam.pdfIn PDF document text
    • http://hmed.vn/upload/files/lerorira.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/kudawupusadobanexoko.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/vaselaverurowa.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/28666863199.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/rimoduvemozuwub.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/mafosopeliwas.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/wituseb.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/43027304564.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vobigefadesak.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/jederesib.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/wofipes.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jusitaxatokefepuviluziwab.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/4463649540.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/pilokisagotekoxujakalula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=watch+9+songs+movie+online+freePDF 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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 17804 bytes
SHA-256: f86048926133d7cb81ee0fcd22b4ee65649c72e35311670339c6b2b3b2fb4283
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 11008 bytes
SHA-256: c0b39c7ba6fda5a6bc4b8cdf97f91a8e93463dbdabda4425aad44aba149dae74

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