Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75ec491a7b547b5…

MALICIOUS

PDF

72.8 KB Created: 2021-09-10 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ea2889a976b229e350fbdc076afa4183 SHA-1: acef43acb4cf6fc7166e9c25db6477cfd7c5f7f9 SHA-256: c75ec491a7b547b5928b53d51a0659b7d9a4dc55fb6aee6b0e5f20a7763e18c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ternovykh.ru/content/file/36811907930.pdf In PDF document text
    • http://geoplan.su/userfiles/file/wuxerebakuvupoxuviwafope.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/62834158615.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95bf50419---daluban.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/74417221086.pdfIn PDF document text
    • https://kaparatt.com/images/File/mozajuvakor.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/59456445377.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/nawozawo.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/fezurisusujereribuzopajes.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87336803101.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/pedemededev.pdfIn PDF document text
    • http://bwc.lt/i/69101607388.pdfIn PDF document text
    • http://pk.mo/userfiles/file/7390149704.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090304465786.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/32355978659.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71027580949.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/37477965090.pdfIn PDF document text
    • http://ahchala.com/img/file/sudutoxivelufepa.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/visovi.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/mikimikamizozu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/39469071632.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613945de9a4a6---fojomewotirafijowofonoxu.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/87199267503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=vector+analysis+lecture+notesPDF 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_off0000b997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 10404 bytes
SHA-256: 3c988fa9687a3bb11b22b2c3c1a8dfe7e8ea902311d1b502e14fa06a7da6aedf
font_02_sfnt_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 17236 bytes
SHA-256: d4cfa76b9f8b1369d46f5d91531f1241340333ebfddb540bb7e22ad062923e4c

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