Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439f2774a0e6ebf…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 00:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b7962edc98d801e19b0df1c84c61b566 SHA-1: e73a6ef5260ea49a47cd9c3e6a1d7275667c53b8 SHA-256: c439f2774a0e6ebf9a0ada2c1acc8ca6a34f85b92edda6f717d6043d2f9947b0
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one identified as a link farm on disposable hosting, suggests an attempt to redirect users to malicious content or phishing sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://huntic.ru/uplcv?utm_term=link+to+the+past+rom+gba PDF link annotation
    • http://hondaototanan.com/upload/files/nefebu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/zemalobaseruv.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927cb8db0a---miweg.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/letazinekugamudekidafowo.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/bupakarajakovarosufaruv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee634b12b---sipan.pdfIn PDF document text
    • http://alkanboya.com/files/file///vujemisaxelapibaderu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/72623046255.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/77778549908.pdfIn PDF document text
    • https://majubesar.net/contents/files/32670041384.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/13546394519.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/poruduwupedubipadexileme.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/30908484760.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/71762516494.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/tevidubatero.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/47678259944.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zenavetuniparupite.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/25405963606.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/2360244156.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/18779497453.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/96682231158.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/68797012937.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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 10840 bytes
SHA-256: 9ba2de5b9d0d8a429241faaa71070cec198b6234354728879522d7ee1ccae6b2
font_01_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233C 18568 bytes
SHA-256: fb2e42cd42e33e07cfc7104ee15adae050d630d24e39288b8169033b3893e4eb

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