Malicious PDF — malware analysis report

Static analysis result for SHA-256 9725c5327bff3cac…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 02:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e68a8d9a56697e85d052303e8517fc7a SHA-1: a52eaa06819ac0a49f232c15c323428a0d3fe231 SHA-256: 9725c5327bff3cac74343fd188ebcd3580ad1465c42f5e1232e5f142f745d10d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to phishing sites or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document delivery mechanism, potentially involving JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fabrikando.com/cmsimple/images/file/68070911333.pdf In PDF document text
    • http://tcsklife.com/filespath/files/20210920094823.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/lawusuluke.pdfIn PDF document text
    • http://budka39.ru/files/25624466221.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/42120872930.pdfIn PDF document text
    • https://nevisnews.com/userfiles/sudevak.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/sebesanezikatozulizasijux.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/71631508813.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/92281615680.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/81880006848.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/23513410336.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613333f89c5f8---xigemogugirimunokegu.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/74781336329.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/jubejufo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407205acd4---49274004621.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109272355084091.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/18058874384.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/49712409991.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/66292040501.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912164812952186.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/76587258561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=dr+driving+2+mod+apk+unlimited+rubyPDF 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_off0000aafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAFD 15104 bytes
SHA-256: 839a9733575655ca399919475885d7263cf7b87b5e610c232ef5c2d98edbdc52
font_01_sfnt_off0000d187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD187 11200 bytes
SHA-256: b208c7072a6fa73e6f4411d0e7b7accf0b2ac5a97506faff8396b6bb8a79daeb
font_02_sfnt_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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