Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0adaf48bd68a9e2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 20:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0191a7fb72c05987d19b229fa1debec2 SHA-1: f1c53a972b3865a29a2b3a32ca5feddbbfcbd3e6 SHA-256: c0adaf48bd68a9e27ac73cb2e1b42613cca3784cd97532050adc43f4350939b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to other potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://saltokisport.com/uploads/files/45969504049.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1daed95d2---71882383280.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/25177424871.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/ladupituridi.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/zenutu.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/figakadaxakipewamo.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/34914005314.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/81698250227.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/jowabitonirafigagifonota.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/74997134652.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210919163900.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/fesuvejugi.pdfIn PDF document text
    • http://pnalog.ru/images/file/venukosopowulojufes.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/vajoredudop.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/79405432815.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/95821854313.pdfIn PDF document text
    • https://izometal.net/mm/file/70551078371.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/nobejefepusijefe.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/44847090473.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/98646766738.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bewapajurewosozuzoxiw.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902045326127597.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/71214611799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+dungeons+apk+freePDF 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10936 bytes
SHA-256: 8a3910933cfe668c6f2ff9501b4e66c293246124173f9b6e6ef27efdfaf01da9
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 17692 bytes
SHA-256: 932391de50813768d5fcf84d096e1a5f87c9b9cb3c29d8125f778863b08b326a

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