Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15be6ed09dd47b5…

MALICIOUS

PDF

70.6 KB Created: 2021-10-08 04:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56ce2d8646a21f5772247a3afac18ee0 SHA-1: 7629c45901577c6fdcbcdc3ae37325d3c261c999 SHA-256: e15be6ed09dd47b538482f925e32c84dc682c9bff39a71da309c47af8fe06953
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this type of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://nomylo.ru/uplcv?utm_term=the+student+writer+editor+and+critic+pdf PDF link annotation
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/78558360063.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sedir.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/18773455756.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/falanepinojopiv.pdfIn PDF document text
    • https://bak.vn/upload/files/66304171414.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/goxagepamobadowolulabixes.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/74402183259.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/1353435324.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/39588006149.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/katas.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615d57cf67da4---12344262238.pdfIn PDF document text
    • http://temple.mo/userfiles/file/17227562507.pdfIn PDF document text
    • http://neteyes.eu/editor_up/sumuvunox.pdfIn PDF document text
    • https://emenu.hu/editor_up/85594410811.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/wapamugoz.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/29032353684.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/70505834252.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/56411214268.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/nepat.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/47539874201.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/29844617550.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/53921629555.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/51925928950.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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC886 16336 bytes
SHA-256: 21ba52e44f9e0c5e1147416ae760a3451438e57e34981fea7c946543004e8e67
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 10820 bytes
SHA-256: bdfda21af5e7833ea8089b1e2b0145afc49f761b30d398c44ac0e6262e758b3c

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