Malicious PDF — malware analysis report

Static analysis result for SHA-256 977341cc41f847d6…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae70849526869594f694c52dcfa2e387 SHA-1: bb0eb5cbae7ab314ea871134ddc0983d0edb99c2 SHA-256: 977341cc41f847d634e60b85b9ba33e43236e40cacb1f34b7add5f500e9cfb88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external PDFs, suggesting it acts as a link farm or redirector to further malicious content. The 'SE_URGENCY_LURE' heuristic suggests a phishing pretext, aiming to trick users into clicking on these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/sifazaten.pdf In PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15489423344.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/91118007112.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/toxevezifitunosevig.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tewomasonupejepa.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/72109639218.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/zuwawenipekixoweg.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/konuwinatopivime.pdfIn PDF document text
    • http://rvhifi.cz/files/file/tobamupasekanotuwezinuw.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/rovifelosipufe.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/5175645205.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/81476463273.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161367687eb6e7---69285353502.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/77793106903.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/netero.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/7180622514.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/17716394761.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/wuleradiku.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/47545036769.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7s4fb5jqhb34315eu8nkp0jl3p/levuxivulenetifigeliw.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/90195267864.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/dujulud.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mitixuwasevax.pdfIn PDF document text
    • http://gibisch.org/files/files/18456687900.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/13061529522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vegas+gangster+city+apkPDF 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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 19908 bytes
SHA-256: be19a8ad2c409d25812eb9ccb2e60e373b92c39c8f3429b17143edb10a1082db
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 10556 bytes
SHA-256: 1eb869373b1fd0018ac01a726414fc6109701b0612e145b205274354940648cb