Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c89b009ea4e9ab…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 22:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81832a08340934731208412be7e29521 SHA-1: 45706f0307912fdddc76c9c18efb52a5e1475883 SHA-256: 13c89b009ea4e9ab3628b258c14d089f6892160b189927a5dca07beb9993dd83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=the+meaning+of+pdf PDF link annotation
    • http://stroyvodservice.ru/upload/File/geviw.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/towosapemanavap.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/difakezamofe.pdfIn PDF document text
    • http://telektrans.hu/editor_up/9523596922.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/faguwavipevadep.pdfIn PDF document text
    • https://mashura.co/userfiles/files/xakuxif.pdfIn PDF document text
    • http://xtra360.net/campannas/file/31771284752.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/volitikugov.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/79392978511.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/52046794183.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109251849532518.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/mebabotufimoriveto.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/latetuw.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/tagemijupim.pdfIn PDF document text
    • http://totoumi.jp/upload/file/99572555726.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210914_002705_156.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/lejojoxozusawo.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_34F7BBF8C0C49A1B.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/21091521035151403960s48u.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77128154042.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/34466816984.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///fovorineselu.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/ximezevatub.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/sosasonatutitoxunar.pdfIn PDF document text
    • 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_off0000b51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 16264 bytes
SHA-256: 9d2df99c9b613904c4da890db4119c4305245a1bf33bfb3d8bd171bf091afb47
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 10496 bytes
SHA-256: 1ae4d138fa8900a8dcd3fc8d3628ed601a4f37ec67d218b60c9544541de9fdd1
font_02_sfnt_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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