Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9410e72843770fe…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fa45eac32a6bc49c76105fe7b7bf5898 SHA-1: 285311e02b27934469e16d468ea2a7d88f097778 SHA-256: c9410e72843770fe9aa8e5bea50225853a533757e240e12d04b7651e0f9c51b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs suggest a strategy to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ikincielinmak.com/upload/ckfinder/files/45210759307.pdf In PDF document text
    • http://lev-steklo.ru/userfiles/file/nezapinevalabad.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613618584e758---nodawowusafapoxodopofor.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/45942586596.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/12366942108.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/borukeranujoxosebig.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1754442848.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/porugape.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bizirobemu.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/javebidepeb.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/57769262707.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/jizegavifojosiwoj.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ee10b70e---xofebuwu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161396567415b0---25110999850.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/70623888267.pdfIn PDF document text
    • http://insei.eu/userfiles/files/32553400501.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/sofinagudap.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/7811100649.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/gapokedukufumu.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/86747592001.pdfIn PDF document text
    • http://terminsk.by/pics/files/malatelebadawikapa.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/44251325516.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/33402846885.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/10569658219.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/96929051887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+check+otg+in+mobilePDF 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_off0000dc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 10556 bytes
SHA-256: 5e5623320ca046a1ed55dbcf4a216a68b9d87c745d17d6f82b5d164a1ac3cd5d
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 18144 bytes
SHA-256: 07079314746484c06393482407423db50fd927e88b78a05c8d0d7a29f188133d