Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a87d582b7b0a4fc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 15:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7044c6d6b6eafd9b873ea2051346f20c SHA-1: 111d49a3669d2f6dcab56b89bde15699c0b34540 SHA-256: 2a87d582b7b0a4fc4724e2640d0cf5107274f5170f19aa1cace9147145bbf2b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links align with a link farm attack pattern designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=android+ruby+interpreter PDF link annotation
    • http://selfmadefilms.nl/userfiles/files/52813356332.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/gijubipemofefupere.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/73389891552.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fagubisalan.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/37812194315.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ce65e49d---10769444811.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7e41025a---forapejujutanatexaw.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210907182251.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/mepiri.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/moxirujubesixega.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/migaz.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33340378789.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vapobawizidafafewuzefake.pdfIn PDF document text
    • http://edeins.com/userfiles/file/zezamagutil.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/ruzelitebiserulijovutol.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zufosokunugobomidorototul.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/7453390279.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/72895133625.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/93243285119.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/xugumisekisuwadev.pdfIn PDF document text
    • https://dom-titan.rs/files/62441312399.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/kolebapisupegun.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/mixezurekiduvunu.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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10344 bytes
SHA-256: b5facfb4992b03b650a4384298abeacdc72747b8cf9865ea6a52e03040a59ebc
font_02_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 19476 bytes
SHA-256: 8809c8c70647bea4b35bfebf97609b0034cd1ebacfdc5c82ef7379b1e47b6600

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