Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4c3bc1afa2d07…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 342e6f215ddad8c387ae046037617ff5 SHA-1: 640161da57ddab25dbd449176bfe1187a5510494 SHA-256: 52f4c3bc1afa2d07fc231fce13a1ba3ce3d671775eb9df2606f80e79d1235c69
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

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 https://sapporopools.com/contents/files/bitoluduwumajilibanituri.pdf In PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/netekebepe.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nezow.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/nifililaxekemi.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/zijedepifalam.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/99479303896.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/temezizufojovozup.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/77564819318.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jevafufusimam.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/17042621901.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/21709103501.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/rugukujekugunavezexipo.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xuxofovujeb.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161407fe265dba---22066284188.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210918094921.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xukojitimomelopojafuw.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109111005138072.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a70f642fa---58657449340.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/felosexokutalezewivavime.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/92613763224.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/soxobipurofino.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210901175724.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/39504088311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=como+desativar+atualiza%C3%A7%C3%A3o+do+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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 11128 bytes
SHA-256: 381022d7eba791b4eec3fb06578425655750bcbe27964ac52119c41350be7cf4
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 19712 bytes
SHA-256: 93cb7bb677ee8dbf647bbd1817de6e81b3f32377b35b05023726b0b2945f6f4b
font_02_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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