Malicious PDF — malware analysis report

Static analysis result for SHA-256 36167df132bda525…

MALICIOUS

PDF

72.9 KB Created: 2021-02-14 15:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48d48d7fbac12728b78e5b9411fd3c11 SHA-1: eb601dcb072df849f3b97e0e3d09be9e02130dd0 SHA-256: 36167df132bda525f3a7327e974ecc95452df8c63dee6735e81ef0c6bf58a7d7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to disposable hosting, and exhibits characteristics of a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://leonvi.ru/wb?keyword=default%20date%20format%20in%20excel%20sheet PDF link annotation
    • http://gedagefi.22web.org/android_studio_unsigned_apk_not_installed.pdfIn PDF document text
    • http://xawikeroteguvu.iblogger.org/nakapunem.pdfIn PDF document text
    • http://azalea.store/aov_taiwan_server_english_patch_apknxks0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fef62afec311.pdfIn PDF document text
    • http://esmoney.site/lulumexalaligoxat17sq4.pdfIn PDF document text
    • http://titodisoke.22web.org/evaluation_matrix_template.pdfIn PDF document text
    • http://cg-designer.xyz/gimofufiseg4hi1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dagubafevipiken.epizy.com/risk_dashboard_template_excel.pdfIn PDF document text
    • http://fukasutatota.rf.gd/xexixokezexofotome.pdfIn PDF document text
    • http://vejimugar.epizy.com/onedrive_android_sync_pictures.pdfIn PDF document text
    • http://delolegiri.rf.gd/backup_my_android_phone_to_google_drive.pdfIn PDF document text
    • http://pulonikolevezof.epizy.com/58463640857.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 5208 bytes
SHA-256: d5817be9f7c3a7041bf3c8a9661a3c7b5af6b5c03f0b6a518bf01753730be52f
font_01_sfnt_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10484 bytes
SHA-256: b5e1cc3c45885667f1a97901a23bd52cbe4933869e07edc22271951dafd7cc7c
font_02_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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