Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3465627ba8687a…

MALICIOUS

PDF

79.4 KB Created: 2021-10-05 16:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3b6fbe54675209139d415171316df80e SHA-1: b760d6ac512e0fff64f70080e2457d62382b6d73 SHA-256: 2e3465627ba8687a1fb2ec6ff0f52c36a65d793b4141d4514e8067db7f0303fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://quiltingacademy.com/fckeditor/userfiles/file/43079735588.pdf In PDF document text
    • http://xy-interior.com/uploads/files/202109252136056425.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zaxaxotimanuparakuf.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/gumisotuwekekuke.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bekavez.pdfIn PDF document text
    • https://brs.jo/userfiles/files/wuligikixodonivop.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/lumawenugesu.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/26058760336.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147a0707cfde---fozomuboruj.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3e0befbeade90b7f82049f8a1cfa22e5/2213932671.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/metavofukibowolaz.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/duzafiberolidirunonuxes.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/motaku.pdfIn PDF document text
    • http://xsteelstock.com/d/files/94614324977.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/30033113405.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/88810805562.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/37191558502.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/bepifezosemogiremuket.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/2180694243.pdfIn PDF document text
    • http://quetthe.com/upload/files/tutanosavivenipanuruso.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/94698295253.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210921025739.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/41077630605.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/92462270958.pdfIn PDF document text
    • https://curvy.tw/upload/files/fiweguvinudiwitibuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cheat+nfs+most+wanted+ps3PDF 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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 18656 bytes
SHA-256: 848b8bb1acec637b2d57c867c138f78299096c6eea95a7baff1daae7e690c1f8
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 10816 bytes
SHA-256: 246e6c88fbd2901f84c3ff707ee5797ba5e8e2b54b94601c8c738a9c6a5cf546