Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce2c05bcae92e2d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 12:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d3fc628bee23a861242e684e3c104fdd SHA-1: 86ca1f936fd20fc793231a905fc5dbc0957dd07e SHA-256: 2ce2c05bcae92e2df330afbfd972176e592c56fe09402e4348387101e0bced32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript, a common technique for executing malicious actions within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or disposable domains, suggesting an attempt to distribute further payloads or conduct phishing. The presence of embedded JavaScript indicates an intent to download and execute a second-stage payload from one of the linked external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://scantech3d.com/files/vokedaxakonurege.pdf In PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/gowuwuweketinugu.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/jetoporelizebus.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/wobaxoposodir.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/40566079337.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/nafamoxufifajipelozol.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/sefupataluj.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/59570549446.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/vilagokojapatokabifub.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/62301880509.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wixigazafu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78fb0af00---dukepigepixosow.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/74621438499.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kutesozubekajew.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/65418111065.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210915200503.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/mebuvimusikoverufu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/21168900801.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/zegodasekoxufewivod.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161313aa106acb---37874977776.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/60784488190.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/jurupizaniterowujakabez.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161355252df4d1---26223795529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dr+seuss+week+2021+activitiesPDF link annotation
    • 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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 17488 bytes
SHA-256: fa07ffa68d8f847c6c91e11dea73baf7d986b692afb077695412093abe2f1887
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10592 bytes
SHA-256: a5f180b8f9a41da47a05f09c53deb0e709d47cb71a0b18618c16dc89b00a857e
font_02_sfnt_off000119a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1