Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47edc10ad4aea13…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 00:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9b5a436413ec556cbe094acdd013cef SHA-1: 1c44c1af96309042df543e86346f5ea37a0c91f0 SHA-256: b47edc10ad4aea132d64b1fd5a749203c6aa1826fabf1db44b7f908e33df41a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on unknown domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://istanajp.com/contents/files/jijunipunugemod.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/21668793843.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613506219fa0c---91223870240.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/24503306079.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/puregamifunutuguvabiliket.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/67410927326.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/tudizejina.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144243a70097---93773395731.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/jiwudinilojosomej.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/gememisizotaw.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/xifuj.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/83897956792.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/34095811652.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/mutisekevebakexawegu.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/vokoxabijagenowadeb.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/lojapakum.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/17804074085.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/141244236.pdfIn PDF document text
    • http://blgjad.com/upload/files/majaxuxored.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/17017743449.pdfIn PDF document text
    • https://castel.ro/userfiles/file/vumudovixixokib.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/zinusimuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=miui+12+download+for+poco+f1PDF 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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 17112 bytes
SHA-256: 21fd74e8b5d1e034a051ab7839d8992774cec1abe0d923efe9f7ff85e77a9c06
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 10564 bytes
SHA-256: 29f8fd84efd1dac0fbe9c1e01698dbcee2bf3be998b2996287ba05d652e7ee91

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