Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fb06a43172f914…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 22:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 591d9b467942b125c6c1016475b15b95 SHA-1: e349f6536708279ec4f5b466e25bef385f28374f SHA-256: e7fb06a43172f914206afc48b86a044032916b5f76158c9d8d76ebff2aaa613c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=m12+screen+size PDF link annotation
    • http://jandenzobv.com/image_uploads/file/tavet.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/v9687rhj4umfnmsvied8v36436/damawufeverabirukese.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/40439901037.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bizapepedekafek.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/givikirogugavosafemekexix.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b18c538---mamojonovaxivenip.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/30057085904.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/71073625081.pdfIn PDF document text
    • http://taigesw.com/upload/files/77547286694.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wivazenaduje.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/91037237444.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/rudebakotinujitezovaj.pdfIn PDF document text
    • http://dsraxys.com/uploads/vovupafidoge.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/lifunolapadezutizuve.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/zixidataxovifuletagavatem.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/78327962813.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/79219163266.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210914120328865.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/julonosezemuregitivu.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/godanojosavojawowe.pdfIn PDF document text
    • https://cmf8.ir/data/file/80046692716.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/96106612975.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/98662999838.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/tuzenulajonetipizunipeb.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210907_D8987B22DB30C14E.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/putikevarexofiregomi.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109140737199005.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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 10024 bytes
SHA-256: 7504e33bc94c53d1ed40bdc2137d65af3694161496ba7187eb090d848f2a42c5
font_02_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 18380 bytes
SHA-256: 2d9cb786ec993133ccb9f83dd67f6dec336e2deadec5ea2105bcd1bca8396d3c