Malicious PDF — malware analysis report

Static analysis result for SHA-256 00db4cb294d0e097…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 15:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32a688b327c791f7a9b47d4d08409ef5 SHA-1: 9ac53e4cce95f37c86c738fdd6a5b58f5214898f SHA-256: 00db4cb294d0e0979cde936d822805dea9caa08197f858ed55863cbbfe90d71d
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. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the link farm characteristic suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://namadagaskare.ru/ckfinder/userfiles/files/78302318490.pdf In PDF document text
    • http://huerural.com/uploads/image/files/38550224420.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613381458e0c4---5430540029.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/zonuf.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/56563186654.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/97296269256.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/75487716056.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/loguduluxugusedofuj.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vidukesukodisunop.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/wuxadijetijubovipuj.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/24479340143.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210910091800.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/90444074587.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/31526549105.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/6304050140.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/51570781869.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/17379436536.pdfIn PDF document text
    • http://floramarble.com/uploads/fajarakurukobaxewanika.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dowajusenukepajokeg.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/duxadenokaj.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/70488294564.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/muritisiragumevuv.pdfIn PDF document text
    • http://ridendo.cz/files/file/nanojowuma.pdfIn PDF document text
    • http://jaqalsports.com/files/file/36370543619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=art+of+war+pdfPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10016 bytes
SHA-256: 9573593f5f57781055af1df99517418835d57c34426b718a585ac45e9d21ba22
font_02_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 18944 bytes
SHA-256: fdc85e0d1f438ac7f11ba9d47f2249833cd49bf4ebcd9371169a69c0468bc1a1

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