Malicious PDF — malware analysis report

Static analysis result for SHA-256 b688763eb762325a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 19:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c8b5f7246c8b32c87ae28753e105cd9 SHA-1: 201f9ed946738d7cc1d1cb45463b4fe147cbc805 SHA-256: b688763eb762325a4a348dc0cc07d81c852558d5cfb1c219797370f541d3a353
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=flathead+fishing+lake+macquarie PDF link annotation
    • http://arredamenticucinesiciliane.it/userfiles/files/49013844224.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/mejomexirumisepawuxejuveg.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/tiwisixaropufores.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/fuwinefakep.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23196876862.pdfIn PDF document text
    • https://pratham.one/file/24878021755.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387934968---kexubena.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/befalaxitala.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/47535143958.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/begakijotebokebekemo.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/47359103293.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/vevefani.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/6931974390.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_003559.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/71995684186.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/34245328827.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/mazatafufuva.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/biditogenubulojere.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/zufudatikonugemiwalu.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/gukezuwurewinoze.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/jekexerakokufivelovaxi.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/jeloxupomebasuxam.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/40149438780.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/labipoxunudari.pdfIn PDF document text
    • http://orem.mn/uploads/files/48012252136.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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 16888 bytes
SHA-256: 520c40dbdc1cd701d71a7c94bc8637d5759327ef4eae19fd46bc6868754a2c32
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 11120 bytes
SHA-256: 90bee5669fa4dd205f9b596a911e05503e22cbf0ed541cbe673e1316941134ef

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