Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d111ada4bea786…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 20:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2758dcea63ce98c3fc6c27dbab3d7b6 SHA-1: 2f8e14b47be2aaae88a4c8fba5367b4753d03f1f SHA-256: d9d111ada4bea786885a0ee999f5e9b26eb9bc1bcb0eaf04e87481903d650c7f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains, suggesting a link farm designed to distribute malware. The presence of JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=windows+7+full+version+iso PDF link annotation
    • http://litroshaber.net/resimler/files/lidegawino.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/88035333444.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/farimivusudagodu.pdfIn PDF document text
    • https://wsbtitan.com/images/file/9221187164.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/75008691026.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/falanivu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/34827106405.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/86196348052.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rijoxusuzunimawedirar.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/56756237742.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/50654806167.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/fonipuleze.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/lolifobegawanixubu.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/45891356302.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134265ce2655---lomigalufuk.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_off0000a6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A4 17108 bytes
SHA-256: 17f4b8a9ebc03b1fbf146a35eb2105eed6ec50f0841b1818d0ab7cf8ec13e0f5
font_01_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 10384 bytes
SHA-256: cebced02222f5285b40769c27514698018e97a98008975cfc26880ea164c8975

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