Malicious PDF — malware analysis report

Static analysis result for SHA-256 018c8239d7cd0161…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 10:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5a3292ec3c58a32407a6f8aaa7d5255d SHA-1: f0a07c0a8f647cbed928e4e30507fda6ddd9d96e SHA-256: 018c8239d7cd0161925d4ed019eed0fd03bcf10c5628c1a57b216eb10e2460e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://12shio5.com/contents/files/sisosejabanazavat.pdf In PDF document text
    • https://stalbeckers.nl/userfiles/image/file/49156081742.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/vopemorizuje.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/47983426988.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/48512288623.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pozel.pdfIn PDF document text
    • http://asid.rw/userfiles/file/lekusirarotolexojenut.pdfIn PDF document text
    • http://koala-al.com/d/files/panipemutujodaxasuneje.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/zejexuvo.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/pevifur.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371111b3710---84655707404.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/87333519931.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/nosipinu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/2803931279.pdfIn PDF document text
    • http://abnicum.com/files/file/lisafewefirubu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/jelavusaj.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210909_131914.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/40148758792.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/97054150285.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/suvutadu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/7811284711.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/vilarex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=picsart+for+laptop+windows+10+free+downloadPDF 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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 17976 bytes
SHA-256: d583ffd417e7b72d207ebe86bf13d9373268c9538b32298e44111b6a078706f0
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10872 bytes
SHA-256: a9a38d43fd07b5a033e78dde71a8aa33f2ee4689ce5e4071d44c64213bd924a9

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