Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f4727b7c0027b5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 17:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1aa3746f7fe4614709bf1b8a38dfe03b SHA-1: 4f5faa3013194925bfc92f8b3c3d6fbfdb608f85 SHA-256: d8f4727b7c0027b587fe0cb0a9ef8315f15acb91a5995197f9198c83f3890d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'smidgel.ru', which is likely part of a phishing or malware distribution scheme. The PDF's structure and the presence of multiple disposable links suggest it's a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=screen+mirroring+z+premium+apk PDF link annotation
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a3d5024a0---fodapufituzoz.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/puzijupegetasibubidavogaw.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/28633245273.pdfIn PDF document text
    • http://eichler-kammerer.de/59385759016.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/xalinifarigoruguvosegir.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/89922239355.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/bukatimuvajowofulox.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/valosulofujejasopuvopise.pdfIn PDF document text
    • http://thecuriosityshot.com/76364069250.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/segajojumibopetap.pdfIn PDF document text
    • http://demkapi.com/resimler/files/74821630683.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xigoginorirop.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88081228511.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/damugukaj.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109110403113857979m8i21.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/kabokoxomifamopakirap.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/87912561082.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/somoxorudilobupamifezetiw.pdfIn PDF document text
    • https://aayams.com/userfiles/file/57090975021.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/vufagumalujodilimowadeb.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/13538655738.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144ccb0431f1---59549831190.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/16040530360.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_off0000bb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB92 10732 bytes
SHA-256: e404e87bcfb532b4e0eb08810813270134a4dfda99e0673b25dc0a36a89bdfda
font_01_sfnt_off0000d441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 17140 bytes
SHA-256: 2bf6399d73450aecd8e4e21d60feda31914cffacfd04780a304a2db5d8db1aa8

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