Malicious PDF — malware analysis report

Static analysis result for SHA-256 5731134eff12a46e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 13:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aa7eb06560107fcdcd9b263a54114c3b SHA-1: f4b0c8f8729a80a5ebee72345301fb2bc998d575 SHA-256: 5731134eff12a46e83bed399bbc1a7b6e22841a0e3fb9152fff0c54e79415072
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or link-farming scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm on disposable hosting, reinforcing the phishing lure. No scripts were extracted, but the overall structure and heuristics point towards a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://synerhu.ru/uplcv?utm_term=android+move+contacts+to+new+phone PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/dijivegari.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/davav.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/46374434235.pdfIn PDF document text
    • http://voijin.com/userfiles/files/87550944211.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/karizevobi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/51172405832.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zulikalunominojeliwufima.pdfIn PDF document text
    • https://cooperspick.com/files/70854953977.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/livoro.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/37387632989.pdfIn PDF document text
    • http://fxlcd.com/upload/file/gifuzonolabefekiboxefu.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/24984703677.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/65578936070.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210907174455.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/17061574692.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/logosoveminugadebozirow.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/xexivatuxilodug.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109130643226781.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/73105489325.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/notisadilexabile.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/tataziwutopapur.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/babumerugukix.pdfIn PDF document text
    • 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_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 17620 bytes
SHA-256: b3591d5a148972520bf8362b94aa1857708197d4d104e3ebd5e7a454c1cae36b
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 10868 bytes
SHA-256: c9351b7889c417e362baec720ae72e71180ca0d0a6e0a7180126c0ce6120d3a2

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