Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5e7453a9d1193c…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 15:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b63806dfaa132f84bd12530253dc06d2 SHA-1: cc0a6d0eeaceaab3f034a785fa585d5be4dd6d24 SHA-256: 3a5e7453a9d1193cf80361a50c1a0487e4df1e15e607f342059edc490ce895d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm on disposable hosting, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. The document body was unreadable, but the presence of many links points to an attempt to redirect users to malicious sites.

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 https://textosolutionslinguistiques.ca/upload/editor/file/57583901742.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e379c8f9348cea6ff5dc356745f3a59b/pisunijog.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/71044251686.pdf
    • http://thietbiantoanttk.com/uploads/files/46832158521.pdf
    • http://rentaruedas.com/files/others/pamekizefalawuxe.pdf
    • https://cevhertemizlik.com/userfiles/files/lifoparimul.pdf
    • http://digitalpolicycouncil.org/imagenes/file/61438163358.pdf
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/28082875899.pdf
    • http://kassa.pl/userfiles/file/83387775300.pdf
    • http://greenld.com/userfiles/90561624355.pdf
    • http://gr-chem.com/upload/files/jumaxunubevogegidoluri.pdf
    • http://analhospital.net/file/files/13054468486.pdf
    • https://slotpt2.com/contents/files/27918081771.pdf
    • http://etkindenetim.com/resimler/files/19684038594.pdf
    • https://thietbixanh.net/uploads/files/59665339829.pdf
    • https://quasar.mago.ro/ckfinder/userfiles/files/vubupaxuwivaferado.pdf
    • http://ieltsadd.ir/cache/fck_files/file/30502307739.pdf
    • https://lexcyberia.com/userfiles/files/topamexuwupewoduvase.pdf
    • http://apex-architect.ru/images/file/54292343301.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/77a795e9e9d3512b7506c12b37653189/desasibug.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/vemigixu.pdf
    • https://isabellepieman.com/userfiles/file/buwiwupedafiwetomoxusip.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210909051757.pdf
    • https://laetitiabernard.fr/images/file/ferogifomor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=castle+rush+age+of+empires+2
    • 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_off0000b796.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
font_01_sfnt_off0000cfa8.bin
0dd70081e5bed69142eddb7992795fe35b25c5bfa3ad8f9d84564f319e18cc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 15896 bytes
font_02_sfnt_off0000f7f2.bin
12d8af8dda921ed9326be73f8567d4813b63a28810ff591a373b674bc3ea90f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 10952 bytes

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