Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0d44e97d53fe2f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 04:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ccd799e59a227a9d28fa11d228925136 SHA-1: 4cf0a0471b8bbad68a7e93c38aa31a676ba7e2e4 SHA-256: 3c0d44e97d53fe2f6edd5c42d21af3b263129cabb876b82b22f2df84b1da9319
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be 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 malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://sahrugs.com/userfiles/file/tojaxukutonuxejawiwoza.pdf In PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/wapekap.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/67359145383.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/toteriwadore.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/gonilanidubafa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367ff29f097---57088503725.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/gasisuz.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/nodenasisigakufanaze.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/magejibuxopumomekigop.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/98372854623.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/67584247232.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/nomikizenuzuzibo.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/23760817104.pdfIn PDF document text
    • https://goodline.by/userfiles/file/59393553973.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387bc130f96---23861042738.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/82266021854.pdfIn PDF document text
    • http://goref.ru/files/file/jabakizidabosusi.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rililujenabatujaj.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/94580970408.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/rikavitapaxulibebiso.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/10314869064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kingsman+full+movie+123moviesPDF 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_off0000b749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB749 10860 bytes
SHA-256: e52374b6d2132a2d4c01905235343090daa655f0e43280b0f5bb462c01ed3ecb
font_01_sfnt_off0000d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 17268 bytes
SHA-256: e196cf991901aeaf9ed9843dbcb8e86c321d7efdd576e33668a64a5072f5e452
font_02_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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