Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a87f8ada83218f1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 03:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7283cc21b3a56ee440f2592adb6bf6bb SHA-1: 320ec41cbecac3440d7831cc59340ca8c836628f SHA-256: 3a87f8ada83218f155f33ee8d58d755b8923cb018c211b8b1fec65b0caaf73a4
150 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of urgency lures and download button text further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=spirit+board+apk PDF link annotation
    • http://tpokebar.com/uploads/files/tinaraj.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/9131972709.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/xatilodovukusevomotukasa.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb9d24f5fcf04f100677971e742ad4d6/nonupuvolusetu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/79043670721.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24778494697.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-14/20210914125955622542.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13271072843.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/donukesiwazukixisal.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/98094554594.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/situgel.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/sojukuvukaruma.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/pulidasufog.pdfIn PDF document text
    • http://vipdiler.ru/files/file/maniwumas.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/4966556725.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/pamedigipizosalabuxesasa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e243a045b0c062608141826adc585732/10472729994.pdfIn PDF document text
    • http://abc-tel.ru/data/File/moxuzal.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109040017592945.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/27692897425.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/pivimetadixoposumipawison.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 18964 bytes
SHA-256: e7df21ed5a25441e7b11294016afdb17c4829ea911ba345dc009506e9ac1301f
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 10244 bytes
SHA-256: 47d8d8fe819a6c7f9d6029a3e5abe8ad1cc129b10e5a6ceee69ada3d341b6c6f
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1