Malicious PDF — malware analysis report

Static analysis result for SHA-256 d179e6b4bbe6c0a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 01:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af7e8d34bef5c27bd7deca87973f7151 SHA-1: 3ea47339e60c5886a94fc15bc69dc3660215f615 SHA-256: d179e6b4bbe6c0a3b40b4635b4c00bdc6489c9d9a216b755c85600206692f8cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external domains, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of many unknown URLs suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lnshiyue.com/userfiles/file/20210902071952_2134984699.pdf In PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8a4698---sitov.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/13875637798.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kawasubofitigalalonifupe.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/88623588.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/53158812784.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/11699187251.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/vuxudofibovupenujirofisij.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/20670421408.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/24265963155.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40660952687.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vedipegawudazovoregiso.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/torofawowexezegedetisol.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/87637207756.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/72495585061326113619d0.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/linolimatidalilefa.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/lisibosimiwidel.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/jemovorokifuxitede.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74704799827.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/25275141063.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/jowabukaxetubipav.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/474585298.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/84043692072.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613758f5824fd---wewozeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+delete+history+from+play+storePDF 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_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 17788 bytes
SHA-256: 48b985cfd6fcbe8646823759714ee7ce3e251103b87dbb27e73b0d017bea508e
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 10852 bytes
SHA-256: 779c403e859806725d01ef6faca15efe8a5551556b41cc0d25e22e5d028b1266