Malicious PDF — malware analysis report

Static analysis result for SHA-256 f511eae7b6199d86…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 16:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b7c89223a9fb359cccd3cd57ac1a223 SHA-1: ec611cda89da29888cf7f59ad00996f47e17c714 SHA-256: f511eae7b6199d863ced6281a923beee00eeb91533dc1a6368779f8712b54d93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it is designed to redirect users to potentially malicious external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://italy-ex.com/images/blog/file/36290311191.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/39442731856.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/59462125179.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_BDFCC564F321B18B.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/23568281336.pdfIn PDF document text
    • http://stringladies.cz/userfiles/belibafapan.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/68912730876.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/63455189125.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/40841154740.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/87821906860.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/dopodomovix.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/13588742192.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mawuvisataximar.pdfIn PDF document text
    • http://hrudolf.com/userfiles/kadesudalukuliji.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bolebin.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161387eb5adc4c---lekupubipajow.pdfIn PDF document text
    • https://ratoempat.com/contents/files/42115913520.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/96801460024.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/51960737824.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143744e70af1---84228909856.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/81382831009.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/98704668378.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/xuzulimop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=no+4g+after+android+updatePDF 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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 18224 bytes
SHA-256: 51a0c21a5fadc82b8e256afc586782b9b42c1f205e0b0239e19576442b1dfa9e
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 10616 bytes
SHA-256: 5f7916d2667925f37ea1e516e3b4c7daeb12255950450db85c184dd64eb3034c

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