Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fddf324e9b167f1…

MALICIOUS

PDF

66.5 KB Created: 2021-02-22 14:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 59475fa06e498e95a38aca7c417c0003 SHA-1: f87023531201f46da7813dba4862d93932de8d25 SHA-256: 5fddf324e9b167f106019b6367e8b1ab6093fd7c8fbd5cad458e756e502edadb
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that function as a link farm, directing users to various PDF files hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to software downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=ludo+star+apk+version+1.35.37 PDF link annotation
    • http://car-test.pro/xunuludli2pf.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/ighZRij/bazetasile.pdfIn PDF document text
    • http://virubedasiv.22web.org/74684445915.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/ham57AZ/sword_art_online_ui_mod_minecraft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444649/normal_5fdba6218564d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_601bcdd199720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5fc603b2b0994.pdfIn PDF document text
    • https://cdn.sqhk.co/bukoxomule/ZcOiegf/warlords_of_draenor_cinematic_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419218/normal_600798431fee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c91dab2e2.pdfIn PDF document text
    • http://temezisabekazev.iblogger.org/cardinal_sarah_silence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_601ffd22e9cc7.pdfIn PDF document text
    • http://xizadewakali.iblogger.org/el_principe_de_nicolas_maquiavelo_resumen_corto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_60026cfe1aaed.pdfIn PDF document text
    • http://cparta.moscow/super_juice_me_28_day_planbpyq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485587/normal_5fdc98ada6a74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_60334c3584cc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pufosibixoge.rf.gd/mabujofibotejuwubu.pdfIn PDF document text
    • http://gigapenawer.rf.gd/17442972435.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F5 5440 bytes
SHA-256: face6743d779818ec5aff1e8005e0c002eeb5960352c5b0d231ba59c661628e7
font_01_sfnt_off0000d8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A0 11012 bytes
SHA-256: b0de5dc884183bc4ba789fbb4a0eb0d6a2c11a1091ca5decf2e70c9d19bec452

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