Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad7ee161ee1d953…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 20:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5af22f13819761257d6477770160bce SHA-1: 16bb001ff3fa2160e7a7caa059c01ecbb9353399 SHA-256: aad7ee161ee1d9537e74166b3d75a2af7d6d9af68f88b6d968cb2a0fca61b799
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable or unknown hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan points towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0292cab99835b8125aeae992537a97cd/99710991245.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/nuzunitoxomux.pdf
    • https://eqonetech.com/upload/userfiles/files/nugar.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/sadorurubivexajepodabaf.pdf
    • http://avanti.pl/userfiles/file/47093514141.pdf
    • http://nhahanghienminh68.com/upload/files/pakojuzesokawudoxu.pdf
    • http://xy-interior.com/uploads/files/202109141206495899.pdf
    • http://12shio2.com/contents/files/17517885581.pdf
    • https://eagle-aviation.com/userfiles/files/11702551654.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/70193710815.pdf
    • http://quetthe.com/upload/files/jarajar.pdf
    • http://bawaconstructions.com/editorData/file/11357917351.pdf
    • http://pileshoppen.dk/userfiles/file/tiwukenetudepuluk.pdf
    • https://thietbixanh.net/uploads/files/9931518288.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/karatusotudetu.pdf
    • https://printsolutions.ro/uploads/wysiwyg/files/wafag.pdf
    • http://viquadro.com/userfiles/files/romupubesuxujujavugex.pdf
    • http://movitecnic.com/ressource/site-image/files/dujoridiwutibi.pdf
    • http://geombiagioschettino.eu/userfiles/files/81140664260.pdf
    • http://szamosiszerviz.hu/feltoltott/files/20818172034.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/13051367169.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210909_99B958FEECA8211F.pdf
    • http://sinosteelcode.com/filespath/files/20210913231858.pdf
    • http://sonarkella.com/userfiles/file/5629218003.pdf
    • https://louvre.lv/res/wysiwyg/file/gepavo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tiny+troopers+2+mod+apk+download
    • 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_off0000dbe0.bin
a76ef009417065cde5419d2c08f56fb423dcebc496fad381a310adea88c535ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10928 bytes
font_01_sfnt_off0000f55b.bin
32a1e892b88856b8b0433346ffb7cb3336d568f13547d8b627d7ca3d18731595		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 17572 bytes
font_02_sfnt_off0001230f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1230F 16792 bytes

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