Malicious PDF — malware analysis report

Static analysis result for SHA-256 5012cdb4fa126029…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 18:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2230da6cdc8c92761bf9dfcc5b6297bd SHA-1: c043eed5004e563f25c53d23bc1d2e29711eed48 SHA-256: 5012cdb4fa12602906a69c9603c2283ce7c7fab43ecf6d0c8590262325cc27b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jm3lrq2ub2oa4faqoh3se7rrp3/87041264628.pdf In PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/nefedaf.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/96689107208.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631475025_1.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/55372363585.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/14692047289.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/mezane.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ae45eeda---mosibefenexujiduvekojo.pdfIn PDF document text
    • https://sealskinz.ru/files/file/64756755514.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/durolukumaziputowokufuja.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/neduga.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/lasejazato.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/gomazagobolukadejelanet.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/54223984300.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/24531495724.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/jekigiginibudirutoxajop.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/67055214687.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dewer.pdfIn PDF document text
    • http://reopen911.info/media/file/torizop.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/xivazajamuvasonosopamo.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/83284052189.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/8265602193.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pejodozon.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/mukab.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/4299180569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sim+u+kraft+mod+1.7+10PDF 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_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 10620 bytes
SHA-256: 433308f8b727828b46d67630b92bdce0f3d0c4042600fd8a31b79f1ad579dba0
font_01_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 18352 bytes
SHA-256: addf249cde33dfddb4561c0d16e556acf063955130330e58a6392e5211b16b0e
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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