Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88647d79404d880…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 00:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65ab96829bdb592d61a4234e688c9876 SHA-1: 7283754206e2ba94d93d629f2d9100877e24a16e SHA-256: a88647d79404d88065322f9314c033437e0d3e03efef849e237d0804f57bdc6c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely contains instructions for a password-protected archive, a common technique to evade initial security checks. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's part of a phishing campaign, potentially leading to malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/sanilofuxef.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/80267308322.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/wurax.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/bidijuv.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/92970037217.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/daxuzif.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/wimikepeloxusedapu.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021911717469715.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xubagexitule.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/25606403913.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613be07a1f522---tezedobemilebijidovuvenu.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/73281324245.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/nomigegawameg.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b4904610add75dfea20c540adda1396c/solafojovojoruvisajulajap.pdfIn PDF document text
    • https://sharenkon.com/files/tasojuz.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/43981455980.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/zoporadirafalanupefi.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/79354048360.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908112814702253.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/dipelerag.pdfIn PDF document text
    • http://drironcat.com/images/file/29189459525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+gt+i9000+rom+downloadPDF 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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 18216 bytes
SHA-256: 53b7f3f8a66d5c9a93fbf442566c442e7e3468c75842697d2ee090a6eb95d5a6
font_02_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 11012 bytes
SHA-256: dfa49e48ee9aa27e7eeff4fba59c12c614b2a43b1f9bab2a88ab920afdf77062

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