Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a92c314a431fab…

MALICIOUS

PDF

79.9 KB Created: 2021-09-22 11:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d83f131868ef83356fec2afd8b2d7860 SHA-1: b9e9785c65b7ce71329f41393d7694a6dca0be5c SHA-256: 08a92c314a431fab84770b0fe53edf15e2f2a63308951c9db0ccf643d97f6dce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://campfirewtx.org/userfiles/file/71493144158.pdf In PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/23076944169.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/7918219328.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/nisuki.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/wozafopojogi.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/6036695692.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/nujadev.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/35102395350.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/nixibinaruwidi.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/90948916263.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/gabalota.pdfIn PDF document text
    • http://ipllaser.in/uploads/6793711177.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/75099730049.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/50470362233.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/57288256945.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/62625747547.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/47472118639.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f087225df5---kejosadazaxefejejinekimin.pdfIn PDF document text
    • http://klhl.com/userfiles/file/60895577676.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/50759602132.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/4077982697.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/31957842384.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/91327639668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=8+trillion+in+croresPDF 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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 17816 bytes
SHA-256: 940ce1cbbf2b4449ca2a4721563fc8bd86a59164db6f0801c4b225a2fc509fc2
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10172 bytes
SHA-256: fa0d7eadca38fd4545a19122a1b3d6c1b0dd2068d6a2ae306759ab471a5ab883
font_02_sfnt_off00011a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1