Malicious PDF — malware analysis report

Static analysis result for SHA-256 4245ef0156b1c1a8…

MALICIOUS

PDF

94.0 KB Created: 2021-09-19 11:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16ccbcd0647b6285440e19a3bf6beaa5 SHA-1: 93884fa40fed31eeb6c6726879041d482ec161a9 SHA-256: 4245ef0156b1c1a826cde4af23ab5e2aac64422e85033a02a7d311706b5c40bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to other PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, which is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/jomusatugagolaxu.pdf In PDF document text
    • http://apsons.eu/files/file/94973020000.pdfIn PDF document text
    • http://leganordavigliana.it/uploads/file/fawolejepojomeken.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/mawuwonixukavawovixubefep.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/dizavulomelelomobo.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/tuwid.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/zewafan.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/45653701259.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3831d0cbe---jiliputuborupu.pdfIn PDF document text
    • http://kvrhousing.com/uploads/muwefiwos.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130d606b6910---93386929921.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/9800358110.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/20376349061.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nupokifabavomigusegirir.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/gajezafesazoxulubo.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wosibew.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/seludipogowoxituwe.pdfIn PDF document text
    • http://isvpro.com/custom/files/gevedipevulu.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/54580439068.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/wuzirenijuborigafuvofuz.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/jubazixomapal.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/waxod.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/94931672152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=evernote+widgets+androidPDF 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_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 18192 bytes
SHA-256: 41f54d067f03355cb09a10e3a5f0c93e21c759563c75fab3f57d04497029f300
font_02_sfnt_off00015313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15313 10512 bytes
SHA-256: 288fb5d4fb9812eb9e95988c65422c2c240fcb2435ee53486663a042cf57acf2

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