Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f525ed9d8e8b91…

MALICIOUS

PDF

68.6 KB Created: 2021-09-10 04:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af860c0f14e711126efd82c73493d5b1 SHA-1: 29e0c15501d46663585786c5d12478a62597674a SHA-256: 54f525ed9d8e8b919ae4b9ccc17e651ac4fda8c8aac1361274ca9e6ff02ef60f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links to other PDFs on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://imosa.asia/uploads/files/202109050712567609.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/dujonorinomigonil.pdf
    • http://swotaweb.com/img/upload/file/sazibugonu.pdf
    • http://putzlappenborner.at/editor_up/juwilifebuwugetur.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/daveleretewuxagakidibajur.pdf
    • https://uangraja.com/contents/files/78925758065.pdf
    • http://trongtinpc.com/luutru/files/mimijosewakamijoja.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/1012752619.pdf
    • http://messtores.ca/fck_user_files/file/kibaridetinagu.pdf
    • http://ovecollection.com/royal/admin/images/products/file/41552023116.pdf
    • http://royalrep.com/userfiles/files/tibugowoguxusazebam.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/38854401081.pdf
    • http://www.como-grup.ro/fisiere/file/85716541536.pdf
    • http://directopinion.biz/uploads/FCK_files/file/jakemixaxegajegixuze.pdf
    • http://smepil.com/ckeditor/userfiles/files/nexoj.pdf
    • https://nurea.se/currency/userfiles/file/gapukuvetixevolojezasuf.pdf
    • http://greenbrier101.com/userimages/xudirezatolefo.pdf
    • http://sartor.ru/upload/files/suzijonubimiximo.pdf
    • http://flagrant-desir.com/userfiles/file/83041579433.pdf
    • http://www.valaisconsulting.ch/file/gigesafev.pdf
    • http://insei.eu/userfiles/files/34122412510.pdf
    • http://tdsns.ru/userfiles/file/2728242136.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fewuxuxotokomi.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/65479564704.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/31251972261.pdf
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/92739921603.pdf
    • https://corpeverest.com/ckfinder/userfiles/files/80303716124.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+apk+file+in+android
    • 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_off0000b16f.bin
b97c41f2825d72fd5c34a6dd2ca65ed630fe3f398172dbb5044944dff126bf7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB16F 14204 bytes
font_01_sfnt_off0000d49e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
font_02_sfnt_off0000ecb5.bin
3e0522a5f32ae7cb374ced88d13770fc2a0feccb46aea6541f6d43faeaef7981		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10492 bytes

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