Malicious PDF — malware analysis report

Static analysis result for SHA-256 12525e8828081581…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 09:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cf21dae045ced0c12236a04ebef0e09 SHA-1: 4bf8b22244e30d965a92779a688484bfdcbabb4c SHA-256: 12525e8828081581804d01de0ae78948f1bf016bee54e5c6427909d2dfa0453f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO manipulation campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=farm+mania+1+full+version+apk PDF link annotation
    • http://clarksville.net/wysiwygfiles/file/rutefeb.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/kedebix.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1f6aea59---32468997987.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143c551b7b1c---tarojegilomuzakanolaka.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/ropesutelidilemovoga.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/53502044510.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/pekefedubelamajak.pdfIn PDF document text
    • http://davobio.com/upload/files/31341366616.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/43135922975.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kofetumenaror.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210907133140.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/xovorobapokavipes.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/85497098361.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/lebisivepowo.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/95212377215.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95550834480.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/48717383204.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///guwogojifabo.pdfIn PDF document text
    • https://hse.tw/upload/file/woresota.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/2683267194.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210907_B5D577C2E42C581E.pdfIn PDF document text
    • http://classtool.info/upload/files/4897255960.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/kizugulip.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/51510950483.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zegatejabalovutoba.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_off0000b4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DC 15648 bytes
SHA-256: bbab8da126af77aa7d32bf8c625782cf44d82b696c3a10d182b882e67f9bcf32
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10708 bytes
SHA-256: 151cfbab4839f676ee2629c566e6d81fae9bed1c65ebc5230394f1e18de59bcf

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