Malicious PDF — malware analysis report

Static analysis result for SHA-256 df396d8e1fd9a7d5…

MALICIOUS

PDF

87.0 KB Created: 2021-09-15 17:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b49d84c66f90bf89f091e723d4394b7 SHA-1: 05147b99d6ced1ca4aa69b18b4221f598905c437 SHA-256: df396d8e1fd9a7d5f26251ca12e9b5d065789226451eb76c608235b1f3b75f9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://funagamex.vn/PhuongNamGroup/userfiles/files/gawajedavuwovekej.pdf In PDF document text
    • http://vpsystem.com/files/fck/nurukipudap.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/27968663454.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/97839109690.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631382216.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bc3b5b6f---87898883862.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/93888829554.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/sapafipepe.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/sabodawalatusofabatu.pdfIn PDF document text
    • http://soupworld.de/upload/file/71844556719.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/lalolexumexopidusu.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/mupum.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/koletakoxumigekidafapur.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bufigulafetipex.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/98852202275.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/40735852506.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77793194479.pdfIn PDF document text
    • https://mimpidia.com/contents/files/2652250561.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/06/lulawij.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/miwamidogamatatuzuteziba.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614106d38be05---jokivowokuxaxiberi.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/depabeko.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/47038667972.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906035012742.pdfIn PDF document text
    • http://askaudit.ru/price/31402364325.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/movajebefaxapaxafo.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/50262797949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+open+sms+app+intentPDF 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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 18456 bytes
SHA-256: 5fcb1f3df51cdf041ba4ff99b4c0d36b125733e4de50074779ed28537856548b
font_01_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 10488 bytes
SHA-256: 036f53b4152c7933dbfd3ff69d0dac4d2f0f017e463a17b92d2ef8e74be35141
font_02_sfnt_off0001362e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1