Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da9dc5d6da380c8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 23:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5a69a3077d094576ebac308cac9004d SHA-1: d6277965569f342dfe171eb9c39f0c998df42b6c SHA-256: 4da9dc5d6da380c8332b4d6ed0e425d099ea77b381c81a01af37db0ce2386a0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The PDF structure and the presence of external links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=gameshark+para+epsxe+android PDF link annotation
    • http://www.benyowsky.com/resources/files/diladobomoletizozofobix.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/tujanixodaposa.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/47651224008.pdfIn PDF document text
    • https://eklyps.net/images/file/64200074996.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/zitizuzubilon.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/81999830392.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/tizutifodivogo.pdfIn PDF document text
    • http://thegioioto.store/upload/files/gutovexibebojoronolepe.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/85511263779.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/bomududobajoj.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/72554427302.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/larobagesedez.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/77156238950.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/movixizinodupixuwidab.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/29081901557.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/59995066927.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/wegutirakuxemadipiline.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/36862640092.pdfIn PDF document text
    • https://slide-bearing.com/d/files/tinunewerulubo.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/87875614973.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/67359145383.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/fibilegilesaxazep.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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 18376 bytes
SHA-256: 383641361a3d6e912267f3e348e3f5b63a270307b1280614ad0b861e00552753
font_01_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 10748 bytes
SHA-256: 7f9dc0fc355c80220bf7442ad5315e8b125c304860259b2173d7abd0f0097bb1
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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