Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13802c277dc22e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 01:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82910f809f5cb4efe5895c7e12e28db8 SHA-1: 713190050ada55685935eceb0cbc7fc539eccc71 SHA-256: 3c13802c277dc22eea672dca40e630c77a54a9e9760340111605bdfa261ba491
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous distinct hosts, suggesting an attempt to distribute malicious links or host phishing content. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ondrejkocar.cz/img/file/4874276098.pdf
    • https://negaratoto.com/contents/files/pusafovujiwifamuroxir.pdf
    • http://atol-res.pl/uploads/file/35014617533.pdf
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/nezubokolaje.pdf
    • http://texinpack.com/uploadfile/file///2021091713195527.pdf
    • https://guptajimarriagebureau.com/userfiles/file/nujejerewibajesiluxeguba.pdf
    • http://szjwwj.com/userfiles/file///96222818601.pdf
    • http://thamcohoaian.com/webroot/img/files/99962887800.pdf
    • http://sarigol.kr/userData/ebizro_board/file/reniribojolobodesut.pdf
    • http://gmtshipping.com/attachment/file/gusowijatefixolavejef.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/37414502495.pdf
    • http://physocare.com/Images_upload/files/87487778105.pdf
    • http://ipceurope.be/assets/file/55978866109.pdf
    • http://vrajacreation.com/uploaded_files/userfiles/files/47990306011.pdf
    • http://energyexcess.com/userfiles/file/dupirarinofitadizaxe.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/28916253873.pdf
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/1535749685.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/nubisofakemasu.pdf
    • https://bikidi.com/UpFiles/WebEditorFiles/file/rixekasu.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/87378545935.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/jiput.pdf
    • http://elcampoeco.org/FCKeditor/file/wipotozezutamaronowi.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bfb9e7dda02596decb9f28eed0ae8459/75216939549.pdf
    • http://saigonford3s.com/uploads/2021-09-16/images/files/10235613926.pdf
    • https://santa.sg/images/users/00000000/files/88650635584.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=all+of+the+following+are+examples+of+database+software+except
    • 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_off0000bd8e.bin
cc51400b163d77ecf492e9f225db705b041f2c158ed9a2b8f56eeab55aa10e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8E 16704 bytes
font_01_sfnt_off0000e85c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
font_02_sfnt_off00010073.bin
a745f5c1cb1e790bb2a2febd31742bc2503f23c1a07aa690f08f29bc7f422d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 11376 bytes

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