Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6169576632469f5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 05:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e3a38e06af1c89c664cf354b7b214196 SHA-1: 26b7d02286be99411f128d8b4373d78096f3277a SHA-256: e6169576632469f5589dd3997eecd6b74a6591b5b4cd1078b685626af99fe6de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://geometrabottero.it/userfiles/files/25052154565.pdf In PDF document text
    • https://strategieb2b.com/userfiles/file/larow.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/79064845360.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210911115456999395.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/nedexuvemakasugut.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/43967954365.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/34861207834.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/46955837496.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lekesom.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090811245269.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/tusezafu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/830375479.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/pulivijel.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/93488899037.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/23423848810.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/nepizufokatijikavatazo.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/68023931981.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/12986360900.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/22535541336.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/83185572497.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/34637446452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+rest+api+examplePDF 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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 17044 bytes
SHA-256: d1d0cde14154a29257e287b87f9670d639daebdb14b3449f23ec44f3e43fa529
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 10636 bytes
SHA-256: 1b974ca2d2133c9cba0c1fef81347f90d3f0499245e523fb24bb01422d655536
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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