Malicious PDF — malware analysis report

Static analysis result for SHA-256 141b20e0c07630ab…

MALICIOUS

PDF

90.4 KB Created: 2021-09-11 22:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de2d22938ce0b8eeef668b71e0927682 SHA-1: 9a277bce91a24c4e1397c59915fa4054fbe3bb8b SHA-256: 141b20e0c07630abe43d281537b9337e6667a13bfd31537ab731a869e34979a7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links, likely to facilitate phishing or distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://jumpinfit.it/userfiles/files/82649348283.pdf In PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/90193119185.pdfIn PDF document text
    • http://master-br.ru/img/file/38637866351.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/safekadipunam.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/96154546988.pdfIn PDF document text
    • https://mlspoland.co/files/file/tonemixufe.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/evawisojureregopajuri.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/joweteborexavev.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/dizukiw.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/13129110391.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/62965693927.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/31443105450.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jadevakibapox.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/satifojugawubupar.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/22217054857.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134fce7424a4---99364620724.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/xikezar.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/5950367343.pdfIn PDF document text
    • http://chikatere.com/Upload/files/maruligul.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/newuvuzadisimek.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/27712811586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+endgame+moviePDF 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_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 17228 bytes
SHA-256: 2db74df0542452c45f44fed8d8e6bfb8693917092e3d29a078e8b795f1b79beb
font_01_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001452f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452F 10320 bytes
SHA-256: 22775440841f80206b1cc737916d6171127d0e56c735db7840b6d931db6a7880

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