Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e9ddcb06f10314…

MALICIOUS

PDF

73.6 KB Created: 2021-09-21 05:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b03025380a9fb196e257f80bc091a631 SHA-1: 63a6c3e9ae9dad16d586a55198a3b62a375ea66c SHA-256: a9e9ddcb06f10314288123055f67d38675111b3d981157f2aec4cbf347fb223f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm containing numerous external URIs pointing to other PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://toonesk.com/upload/welogexopanazipikuroj.pdf In PDF document text
    • https://lapalettedesarts.fr/gestion/file/30768043470.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fenasaviz.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109140948411291.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/53361971766.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/91756031798.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/53950972980.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/67223159404.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mefemosafemufibafot.pdfIn PDF document text
    • https://novsport.com/content/File/jilesutezebupexotaviku.pdfIn PDF document text
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/woxafuter.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/wegibegapefezefoketuj.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/67854338483.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nudipivazuter.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kagumiso.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5313f968---porixuji.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/98833496370.pdfIn PDF document text
    • https://istanajp2.com/contents/files/93044878515.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zoginakitekegixovev.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/jomabugevejujobebun.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/80084092855.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/83728810171.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/kexuwepedajezavifej.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/xuvidigi.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • http://santeh.md/img/files/kuvomob.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/9453707323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=triumph+dragon+qr+codePDF 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_off0000bd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6A 10856 bytes
SHA-256: 126b3739e80c9765ad6e5b0e5e5fdcfa2e9edc2fdf40ea8e5516b9889a4b4d0a
font_01_sfnt_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 16568 bytes
SHA-256: 0dbbac6d4fd2c7cd1fc473f94127a40fef2a66054b4d96d4d577cee3ce71af55