Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c945288bd37886…

MALICIOUS

PDF

88.9 KB Created: 2021-09-18 05:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eae580c7621f3a27d1e5b4637ce58c7f SHA-1: e1f5a8071061d613fd0c3f281ffda5d791d08227 SHA-256: 19c945288bd378860c737bd57e57c23e54e19da9fb468dff641b2545eee79884
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the embedded links suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ansatrans.ru/admin/ckfinder/userfiles/files/betipulipiwipitapoti.pdf In PDF document text
    • http://clubselectionvoyages.net/images/file/dikulanidogepewe.pdfIn PDF document text
    • https://kimcert.net/E/file/teravawobobumimiraj.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/11665328084.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e05f5646bb---18654429517.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613944766942a---45598774146.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gowunefuwa.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kekomodutazafedu.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/maxofadanotalufisikisa.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/sugekivu.pdfIn PDF document text
    • http://mlmrockstars.com/ckfinder/userfiles/files/bunofivubutenigopagujezu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/femasubisoxelulutomi.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/lowodofe.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kikuvifebomivuwerugeb.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/visonogaf.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/73834006216.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/88778391238.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/98053960795.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/40533284350.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533b13c81b---pewixijomebiw.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/wubixakativ.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/86039970809.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/92285118731.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210913131159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sarah+michelle+gellar+i+know+what+you+did+last+summerPDF 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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 18168 bytes
SHA-256: abb390ddc73f32620db39fb305e5bc25038b88a2a6dcdf3bc5d39920de6d1d68
font_01_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCC 11284 bytes
SHA-256: cfd6ad7987022ac012767076a9ab1cf982b8475c6f297c444724be40e8da3d21