Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45330f75c566e00…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 19:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d89f2d22b89b425e3e50ee00b67de57 SHA-1: 153981f1aef50457e35d711a0e074e61fd08660d SHA-256: d45330f75c566e006d4369e8bbc3cb20e643ab29bbf69f4c5e8a2fd02609521e
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a non-clustered link farm on disposable hosting. The presence of a 'download button' heuristic also suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://centreforeffectivecoaching.com/media/file/betaxivibamoxunirus.pdf In PDF document text
    • http://vladekoservis.ru/files/zasizakikobupixigapa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/8923892809.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/vojovekilopita.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/1672014269.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/24296793039.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/96599136207.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/kikepisadakubowego.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1fbbe641---38219861021.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/monolimeronoba.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/wijuduj.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d43977727a9baeb1d3a5da8047e77742.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dijubikotivu.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/vidurizadelopowuxe.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/rogovuta.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905095251.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/63425061254.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/7161839733.pdfIn PDF document text
    • http://eternoohydro.com/d/files/zinidagogosava.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/xuzib.pdfIn PDF document text
    • http://ewtch.com/upload/files/26996374190.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/78728392152.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/kubofetabule.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/80036090828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=intro+maker+mod+apk+2021PDF 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_off0000dab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 10584 bytes
SHA-256: 5f0315bd2460747daee47a2e00c456e9c82b3e0d7102cbdcad76b3ee7838076d
font_02_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 17244 bytes
SHA-256: dabe91c3483baba9882e0761d6ea570a99d614beff65daa77ed8665039b36e41