Malicious PDF — malware analysis report

Static analysis result for SHA-256 4531eb8cb3d96d06…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 00:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b592b8166e6cd0ce3a30e42c8b91ef3 SHA-1: 59949e043c03c33d6f1ba4a889c13bfd6f8b1edd SHA-256: 4531eb8cb3d96d06ae877f665fcebe50d006e544211d800f6282d4d6c23ecce5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm designed to host many PDFs on disposable domains. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution scheme, likely involving embedded links or redirects to malicious content.

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 http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5f40f8c7---30759802345.pdf In PDF document text
    • http://www.pilartangguh.com/file/lokatesokulovagedelis.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/90489168527.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/32369511256.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/97922272853.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/60359724062.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wugorokexutitutegofufebix.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/volezekiji.pdfIn PDF document text
    • https://brs.jo/userfiles/files/duromopoladexo.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/wowalaluxumagoj.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/dinutebobelibawu.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/36684110664.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/20700535724.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ec4018b3---46177293275.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/lemovunubenuladebizuw.pdfIn PDF document text
    • http://artediapharma.com/upload/files/39787861932.pdfIn PDF document text
    • http://sartor.ru/upload/files/64548692947.pdfIn PDF document text
    • http://bptramptour.pl/files/file/siwokumivaribokitev.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/46084058474.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/mogajabawebaza.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/84486586362.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/mirabuxuseb.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-16/20210916040401514231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=redmi+10+pro+vs+poco+x3+proPDF 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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 10824 bytes
SHA-256: e563a30e58df62c4529f8552275d84dae8904271137468878733a43f644c0e40
font_02_sfnt_off00010a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 18292 bytes
SHA-256: 3ce63b9f9342eb1fa5b5b0f88876648071b6f0214fe9e63767a007b7efb2fdc5

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