Malicious PDF — malware analysis report

Static analysis result for SHA-256 3feea23d54127c77…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 23:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ca11e89f3721ba3fdcf37b15b35b090 SHA-1: 615ea7d886f475f97f7636cfe869a71c14c067e1 SHA-256: 3feea23d54127c7798efa1ed12d625b29b9eba701c257c13ed5fad2ca8bcf42f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an embedded JavaScript stream and numerous external URIs, including one pointing to 'infrive.ru' with a Minecraft-related query, suggesting a lure to trick users into downloading a payload. The presence of a link farm on disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=minecraft+minecraft+pocket+edition+apk PDF link annotation
    • http://tuanayapim.com/rsm/files/82351053154.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/89392196141.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/84565025348.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/latetuzukanebim.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442658572e6---8964602995.pdfIn PDF document text
    • https://cargobull.cz/res/file/bulajegog.pdfIn PDF document text
    • https://proia.bg/userfiles/file/vunolo.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/53444915327.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/taxisufosasafolimulaf.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/detitidux.pdfIn PDF document text
    • http://pankajplast.com/ckfinder/userfiles/files/duretipadog.pdfIn PDF document text
    • http://strap.sk/uploads/file/logorefufigex.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/joginigafuwiwegotodum.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/98288524837.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/nipibavuvowevoraginagefa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f53477d---91100600692.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/92687263731.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/85589883505.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/76893497015.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904075353273918.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/42610110693.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/1912618761.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/64841944223.pdfIn PDF document text
    • http://atek-ent.com/upload/file/77949898580.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_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 18560 bytes
SHA-256: f19e901d34ad0d76d54f59dbbbab86adaa34523469e46cc586932f75ce2c9641
font_01_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 10652 bytes
SHA-256: 39d147aed79115804cfb069d7548fbb56046ae3ee040155023ab5c276d61f919
font_02_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1