Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c7205b18fef953…

MALICIOUS

PDF

71.9 KB Created: 2021-09-11 22:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ce320eb89e0c96bd8df2b1ad5a0f1bc SHA-1: eed52bd877f7d21be83d2512d2b9133a43af9be9 SHA-256: 38c7205b18fef953c041a39f6f274a2043d0c1e96c095e47f667eb159884797c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to other sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a malicious intent related to link farming or SEO manipulation. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://bokaichenyu.com/upload/files/81478556540.pdf In PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/87664340972.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/dufug.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/zozuzaweloxupevosogup.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/72300313015.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83190207631.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/76612487739.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/72426214426.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/tuwizig.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/nozopugofexisejotepazera.pdfIn PDF document text
    • https://dcimx.com/files/kivuj.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/90121074273.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/wovoli.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/pivalefamisipu.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/gigesawanedajag.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/fibanuravo.pdfIn PDF document text
    • http://ccsl.asia/files/xufenixerererurotunenow.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lnbtic0tiq3m5bg4dk6lellr79/kovepejabenesuga.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pubus.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mafosanekogeledubodezaz.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/toduvikasixigikotatupi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903045605_2pghlh.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/17201405866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=rail+rush+game+download+apkPDF 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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 15416 bytes
SHA-256: 07c57cae64e636762db3a9f4d1bf4cddb6f52f9f64bcb3b52f7554e55b7b3294
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11064 bytes
SHA-256: a23db3f5aa56b4f20e7035e32f39dbe99f6896a386e24050d5871d4c8a7c1471

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