Malicious PDF — malware analysis report

Static analysis result for SHA-256 82134cdf8170fe85…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 16:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d7fad50fc1af47920b300deeadde580 SHA-1: d07b2dcf60ea8a91e2d611432c8a836f5fe59f40 SHA-256: 82134cdf8170fe85825b46342a2292d371fa88d26871105288fedb3ad09f4305
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a specific heuristic identifying it as a link farm on disposable hosting. The `wkhtmltopdf` authoring application suggests it may have been generated programmatically for malicious purposes, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=android+realm+database+example PDF link annotation
    • http://yasairamenbar.com/uploads/files/23564252921.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jivutovopalafaxuloba.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/2438771427.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/47539682916.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/14573769726.pdfIn PDF document text
    • https://beautydent.hu/editor_up/fagulubopazebajusekorepi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613460cba77a2---dukofajixud.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090820233441.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/monunusodasiju.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/panalurefodalodekoguv.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_13_04_37_24_6422.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/3293164261.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/84819376096.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/totinurixeti.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/siwevukafod.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sepizoji.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/rirotisogogamodixe.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/76044628019.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/volepodiraduripotos.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/jatisukin.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139446c0802d---jaxevomuwu.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/12689763141.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/19781848068.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/domixewexutesiseg.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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 16544 bytes
SHA-256: 4eed23964bfc5639002632045191b14734d5bd9bf3f9bdbb5276d852f9eba4de
font_01_sfnt_off0000dac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10776 bytes
SHA-256: 651654bec1eb377f14a3134b22330d7ba44481135b2c6aadb9696c59fbc8391a

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