Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee4419334902d43…

MALICIOUS

PDF

67.2 KB Created: 2021-09-28 23:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c29e051514ebe1da3f1b80b3cf1f9ea SHA-1: faf42d9edf5abeaed913cb0c4fac0121ee9c7ca9 SHA-256: aee4419334902d439a39384618b9180a7ab5f07fc97d8b365711f57d1fc16690
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=weathering+and+erosion+worksheets+pdf PDF link annotation
    • https://perfecthospitals.org/FCKeditor/file/wuxalepanaxedijifikumuli.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/56746977320.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/85206268229.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/81128191828.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303bb87c16c---gexulowilodum.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kujimolusirulugamati.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/niluranexev.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/sowinavizoputomajone.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/diravexogijugomuxavuf.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/40648708472.pdfIn PDF document text
    • https://geniodelweb.com/file/fivevavupolotigajejowafa.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/sasulanisolile.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/dubilejetunepiwazenimigu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101609405340.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_off0000a938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA938 10904 bytes
SHA-256: 7d69e8e52e807dbe2c433fadf41f5ec1a7340a01afc532596fc72c794064283b
font_01_sfnt_off0000c245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC245 14856 bytes
SHA-256: 174cf1dd312127fb83f571da173c79854f4ac45a02c2b2903dd4e96f1a819dfe
font_02_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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