Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80e44b9005dd2ea…

MALICIOUS

PDF

73.0 KB Created: 2021-09-30 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46edeeb8ca76817e56190d0a834c86ac SHA-1: 409dce36841f8c1088c5a3b8e3c32bf574843f3a SHA-256: f80e44b9005dd2ea0823b9da700b7b15559acd2ab260aec211109db1514f798f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the document as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked as benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://globalfeedindustry.com/upload/files/49344402400.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/24595490453.pdfIn PDF document text
    • http://ailizia.com/userfiles/55978670790.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/21762894332.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cef843ac2e0c04f3cf7d146d2019578/murulizowujabenires.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wobijedejusakiritapabadov.pdfIn PDF document text
    • http://mamam.by/upload/File/file/1915671068.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/voxogerotakan.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/57900537382.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/60542892691.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mikuxuxavozonomuputi.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/59882443651.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/1957420477.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2dee75837---94323672506.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/kipuwunivasemefufobozav.pdfIn PDF document text
    • http://rinsacars.com/files/others/disobuxolijoxesasovuw.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepumanavixofegij.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/pabexoxofegesoxo.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/waribuve.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/1964181933.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/54939291029.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/43761993649.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/sotibanegikugigise.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/62536458115.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/34402383665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=office+365+login+my+accountPDF 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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0B 11124 bytes
SHA-256: 30928890b9ea49a682aec89e13d483617620a2fc102bc898b5bb2ea2571e6ba6
font_02_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 18360 bytes
SHA-256: 574e2f9a121d38745569a1bc1353b9c9866cb24962a915860b6df9266672b974