Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bbda1fa374be2d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 21:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4204ba02eb430d18fa9a2707ca14ae37 SHA-1: ac481de4ba3e1b90a8170bdef8e5bc9e4f9cf77f SHA-256: d2bbda1fa374be2d30b4cd9f655dbfd1e2bc82cc93882d0dbce31573a236ed47
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161330e0ce76d5---33967322082.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jimagulidipixasakapok.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161315a86b4a2c---92081824686.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/rurawizanakujowonut.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090918121898.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/82230946697.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/texodevikibakexubomakobo.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/fuguvatuxogiwozoloke.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatulifuvata.pdfIn PDF document text
    • https://kawanmto.com/contents/files/vukotapiri.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/bisizurelidekinatenujuket.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903132032285019.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/wolulizudovurup.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/27554148017.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/fuvokubovuxaba.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/buzobelofezak.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/sukurepemezawox.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/94680321235.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fj3timoofk2jm0gs107jl8gqgr/89673666291.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109052108546516.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/wegob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=macbook+pro+loading+screen+stuckPDF 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_off0000d258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD258 17112 bytes
SHA-256: 5cc1624fcf998769e09225f84a50f890a028d44e75e8ccb4240fae14d5ff3cfe
font_01_sfnt_off0000fe35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 11012 bytes
SHA-256: 23b86ef9ded6ecbb4d6d8c41b1b845af6386947eb0b40eb6487288ae49f48a87