Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf86de18239c9bff…

MALICIOUS

PDF

82.6 KB Created: 2022-06-01 07:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 8de126eb4170fbc62855d5bcaf831350 SHA-1: e91404990a1b2bd6ceb131beaf8528856ec09724 SHA-256: bf86de18239c9bffa3e6ab18504fd03d3eeea7ac87a6764e0e0a5df66c343349
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, many pointing to Weebly subdomains, suggests a link farm or redirection mechanism designed to obscure the ultimate destination. The primary malicious URL identified is https://loheb.co.za/YmrXLWy8, which likely serves as a lure or initial stage for a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://loheb.co.za/YmrXLWy8?keyword=accounting%20the%20basis%20for%20business%20decisions%20pdf%20free%20printable%20version%20pdf
    • https://wunafukolig.weebly.com/uploads/1/4/1/2/141278828/rudofo-linoke.pdf
    • https://gujukajiw.weebly.com/uploads/1/3/1/4/131437807/0408b1fbc5.pdf
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/3697196.pdf
    • https://wanudoratuxeno.weebly.com/uploads/1/4/1/9/141934970/772fe7c3569.pdf
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/4199607.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1626b5a9b5ba13---zimagebiritolakosoril.pdf
    • https://rikutokamalaru.weebly.com/uploads/1/3/4/3/134319242/bumowibuden.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/1277142.pdf
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/7824440.pdf
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/4357284.pdf
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/fixudogomefudedopano.pdf
    • https://rusopanuguxixat.weebly.com/uploads/1/3/4/6/134640346/32908ac9f.pdf
    • http://tuvanluatdanang.com/upload/ck/files/72858933629.pdf
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/betil-sejox.pdf
    • https://sejusujuwo.weebly.com/uploads/1/4/1/3/141327369/641cf7cc3.pdf
    • https://middletonchambers.com/ckfinder/userfiles/files/46792146515.pdf
    • http://www.asap-recruitment.net/upload/file/40070602440.pdf
    • https://tubigadipoguk.weebly.com/uploads/1/4/1/3/141389010/2747110.pdf
    • https://guzuvego.weebly.com/uploads/1/4/1/2/141255716/7958063.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc03.bin
ce8651594b723a3069f60afc81a0796503a3fc37cfc0a102b12a8cff06bc1922
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 17736 bytes
font_01_sfnt_off00010a5b.bin
3f35ca2153b840ee33363eaa47c9cbf6fe44c808683a76e9e2ebf10cdc1ecbfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 11184 bytes
font_02_sfnt_off0001241d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes