Malicious PDF — malware analysis report

Static analysis result for SHA-256 d181a69edee894f6…

MALICIOUS

PDF

95.2 KB Created: 2021-09-21 17:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc20aa958ce22e1a6e0bec9f320f50fd SHA-1: 33ec7d4e4adc2ec431a1fc90e11b2cdd5ebf748c SHA-256: d181a69edee894f6a9127c5afde8a8c290e40a116ee27bea3dded1943b55b56a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pankajplast.com/ckfinder/userfiles/files/gorovaj.pdf
    • https://bostaninsaat.com/image/files/64833839997.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/baxapigaxafadow.pdf
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/25161894561.pdf
    • http://chetaomaynganhnhua.com/uploads/files/rivewi.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/ferejabixad.pdf
    • http://palestraarkadia.it/userfiles/files/kujukir.pdf
    • https://defi128.phpascal.com/userfiles/files/66383704121.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16141266daf4a0---wudisakuromexaje.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/14691485390.pdf
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/28276614084.pdf
    • http://abwnickersonplaza.com/uploads/files/93304618857.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/kelufupizuzofozudiko.pdf
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mogomemadawufomexapiz.pdf
    • https://yenhuy.vn/upload/files/zemabikukuwuzevomalu.pdf
    • https://helicopterleasingservices.com/userfiles/files/73745854888.pdf
    • http://creativecoms.net/userfiles/file/68285339772.pdf
    • https://penzion-pod-rozhlednou.cz/img/file/xeboj.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/48066482568.pdf
    • https://xtrafitcoaching.com/www/images/files/federetemakabe.pdf
    • http://domosplast.hu/files/file/19687611730.pdf
    • https://mauspro.net/upload/files/37000499693.pdf
    • https://jotekonybakterium.hu/userfiles/files/63218572038.pdf
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/66637209838.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/posomada.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wonder+woman+1984+movie+online+watch+free
    • 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_off00010824.bin
a097c7b778d4341eaf059d0062a7b68af8693ae555ccae553185f93cf4172c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 11224 bytes
font_01_sfnt_off00012261.bin
3ead1d95ed772d6cfac0344ddd61f8944ffc61b27d4b2bd414932521db391cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12261 19940 bytes
font_02_sfnt_off000156b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 16792 bytes

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