Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a3697d10368b69…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 02:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4c92933c726ad268732825c0bba1f68c SHA-1: d52623a83a04f36227f8498207d43a527ab04d2f SHA-256: 55a3697d10368b69f48a1b801fa1a84a54f9537d4026c1a11a1e3c724f986585
134 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript that likely attempts to redirect the user to external URLs, as indicated by the PDF_JAVASCRIPT and PDF_URI heuristics. The presence of numerous URLs, many associated with link farms and disposable hosting, suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://garglob.ru/uplcv?utm_term=street+fighter+4+free+download+for+android PDF link annotation
    • https://phoenixturkey.com/upload/ckfinder/files/ligozudige.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/wexadarolediluvureno.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/juzegibojekubifepuri.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13410298569.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613381519c598---37268640137.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f02419824---kupojeguzaruzoba.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/digujigekefo.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/watepi.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/jafelixojilalilegux.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fulofamesepasesemoniv.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/70660118051.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/jipadobimunelexe.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/suvewimuzif.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/8110745138.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/xuzokuraboban.pdfIn PDF document text
    • http://jainfarms.com/uploads/duzilikagobemon.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/66650181698.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/defezuwinutogenafunogafe.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/60390864831.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/96813192448.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/83585676905.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/mizexajutig.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/majitepobojuminamalewuno.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/jitezejebubogesimug.pdfIn PDF document text
    • 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_off0000affe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 14912 bytes
SHA-256: af401ba6b2784ea83c435969f9b7db4665c47e0a686a0df2aca99d8caafad7ed
font_02_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 10704 bytes
SHA-256: a32fba149ab93158cd90976f7f4c4156ea51104bb33c834d8a928dc2857f7f7c