Malicious PDF — malware analysis report

Static analysis result for SHA-256 842c6f97c0f1cdaa…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 02:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1447bf0df0e06d85da6050eacafb6b7f SHA-1: 73bb8136bf6c521bbdc706d86a1f7e509f015ac0 SHA-256: 842c6f97c0f1cdaa1b8c8fdaff3e239876892bfe1aeaadde688055ed6413ed1c
126 Risk Score

Malware Insights

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

The PDF contains a large number of links to disposable domains, many of which are used in a link farm to obscure the ultimate destination. The primary URL suggests a lure for downloading a game mod, which is a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=download+8+ball+pool+mod+menu PDF link annotation
    • https://curtain.jinware.com/upload/files/kawoloziwozox.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/80167297287.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/84650703670.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zirotijukikekuj.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/retudetufopipokukebamok.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/fda3e871ac3ec3493b8b4a491d88ed0b/11850920385.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba49849c2c6ac2577ab871b347c552a5/saximaxike.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/rizotugegozaxek.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mekivewikevusevedokegira.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/jejexifiv.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/47540081870.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/85941470531.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tifikajaborelagusar.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/52903569817.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad889160---vizaranif.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/magejibuxopumomekigop.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/tinosizuwa.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/popubabonixusutorebosaf.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/38328973832.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/51106609774.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/38160740019.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210917_6476F52400F8E1E4.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/74702632170.pdfIn PDF document text
    • https://eguiders.com/uploads/fixemalipi.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 16984 bytes
SHA-256: 43ca1bbd18c9e1c5fbf3c295ca151cb512d1b22d8d4b76a5d85276f0c3341fa1
font_01_sfnt_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 10628 bytes
SHA-256: 6862ac67b20d1e154a1e2d9ce48c40c8c5c78a0a52b80e21dadee729ec8112bc
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1