Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0faeb44f999e626…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 19:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56f9b26226a22978659a879165fdf9e2 SHA-1: 72fc2a3ddafe43d6d1682d8f397037afa516bc5f SHA-256: a0faeb44f999e626157618222f16656b2a0f54f497f72bdc1a149124acbe8ab1
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://votejoedestefano.com/editorData/file/dajagerapaki.pdf In PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/98457478462.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210902125126.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/xavasixifabonelukaduboz.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/21203853288.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/29665565696.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/84951511406.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/16840490594.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/guzijibewasadi.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/52977548527.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/64472040798.pdfIn PDF document text
    • http://medica-brno.com/files/48083989683.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/liravu.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/zebagu.pdfIn PDF document text
    • http://anpharma.net/upload/files/53860047686.pdfIn PDF document text
    • http://tayles.com/uploaded/56753962389.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/39410052020.pdfIn PDF document text
    • https://peterdegendt.be/file/mefure.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/19524690717.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041951189379.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/lesebuxurutetijobekevize.pdfIn PDF document text
    • http://ipllaser.in/uploads/salakemuwonufusodovulinow.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4b281a0a---4879708134.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/71975145134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=youtube+red+apk+download+latest+versionPDF 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_off0000ae83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE83 15236 bytes
SHA-256: cf2e4a0c52af1857e836603e460ce5686bedb69039a15706c5e2fecd8ea878e5
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 10852 bytes
SHA-256: f8f0d7e7a00389ef3dde43a4a37db2151caabfa98fcb7301c3c352cc4eaeef14
font_02_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1