Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ff370ab998c32a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 10:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fe941d142c64ee89efdc9ba25eeb70c SHA-1: 817e7cd38ba492cd85ae459aa5fd53bc7ccd8d32 SHA-256: 82ff370ab998c32afe12395a2e6a492e61eccbaed84c2407d684ba64acf65b7b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.babetravelling.com/ckfinder/userfiles2/files/66553589659.pdf In PDF document text
    • http://twgo8.com/uploads/base/files/202109082358371043.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210908_875FB6193378DE40.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/38099228661.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/nifuxesaremekad.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/87878758423.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/42227218748.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/47123740192.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/36414230320.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/69089974495.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/kapikuret.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/rajinigabigakedajutoju.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/90625511855.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tejiregovafixejagetowamu.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/83805646155.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec01d8a7e5---27742418783.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lalorizeranuwake.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6488043470.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/40169750532.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/selemawopazasikubumok.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/buzojewozegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dj+android+appsPDF 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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 17656 bytes
SHA-256: 0abd6cf17f3634a73f5bb82ba171871128bde7190999ad02c9f1154b70adb046
font_01_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001353c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353C 10240 bytes
SHA-256: 2794036b20aff0660b21c804aef71845e4152bc00ac6c0abe5b1e325f41d427a

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