Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbbfbfd7958243d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 02:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da48900a8382fcc9073e7516880e8936 SHA-1: 9c19c2b75d31b9a0dd782a2aedebfa8e33b30788 SHA-256: 6cbbfbfd7958243d4875b6937002f7af10726501c486e75ca0a3e449bb7ae6b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the overall detection suggest it's designed to exploit users through deceptive links, likely falling under spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juveneloniseja.pdf In PDF document text
    • http://wildpflanzen-planung.de/file/85708702456.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/sixujigevapuboxi.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210902_C2B69C7348D0CC4D.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd8ee698a---857888635.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/72055325729.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/dalasabatowasetulok.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/95177958752.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77614802955.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/17905281081.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/l1igbtrccugl0elgpq0b1md6kt/patuxunedipesakijofi.pdfIn PDF document text
    • http://goldmustang.com/files/files/92180314259.pdfIn PDF document text
    • https://invest.pl/userfiles/file/10148410911.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/73205351811.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/6371760953.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/kegolifoj.pdfIn PDF document text
    • https://rippa.pt/files/file/sexes.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/76119509054.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/rekixufudodat.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/dasanoxadofufu.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/77822828870.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/ziwafosi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zexevuwojujuzetunel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+dwg+viewer+and+editor+apkPDF 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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 10800 bytes
SHA-256: 9ff3dba34134507cd5bff25ce133cf9296865ed3a336a1278973c400bca8b0ff
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 18372 bytes
SHA-256: be31c5405b551aa6d539d132c716f131616b17058e85c42e5094ef0e6071b05b