Malicious PDF — malware analysis report

Static analysis result for SHA-256 495b5ca4e2dc6fe1…

MALICIOUS

PDF

71.2 KB Created: 2021-03-31 15:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f718bc7f285ad2fed3055d9c623b2cb2 SHA-1: d7df8ddaec03896e73cd20802706e2518f8ba490 SHA-256: 495b5ca4e2dc6fe14d1db96993bc0bd1502877644d3daa390ca769e8304814d9
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a dirt bike sale, directing the user to a suspicious URL. ML and ClamAV heuristics strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=honda+crf+125cc+dirt+bike+for+sale
    • https://cdn.sqhk.co/nodezaneripe/ijfjd6n/coc_hack_apk_clash_of_clans_free_gems.pdf
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/zilugaw.pdf
    • https://cdn.sqhk.co/bupitagalir/iihjYtu/duke_s_place_sheet_music.pdf
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fc96965f21b9.pdf
    • https://static.s123-cdn-static.com/uploads/4385020/normal_6003192a0fa15.pdf
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fe0f3671a508.pdf
    • https://lubojedibejet.weebly.com/uploads/1/3/5/3/135329630/sekorekidonadomedop.pdf
    • https://cdn.sqhk.co/liritefebat/bVjejbQ/nupisoguloxobojavosetij.pdf
    • https://bufumuwo.weebly.com/uploads/1/3/1/3/131398085/3779919.pdf
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5fd23995be8a7.pdf
    • https://cdn-cms.f-static.net/uploads/4374360/normal_602f1fa732e6d.pdf
    • https://cdn-cms.f-static.net/uploads/4454184/normal_603e248386b47.pdf
    • https://static.s123-cdn-static.com/uploads/4446382/normal_5fe5450333ee5.pdf
    • https://cdn-cms.f-static.net/uploads/4387562/normal_6046a7e84f788.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nemafu/18918983924.pdf
    • https://s3.amazonaws.com/luramamelolem/what_do_you_mean_biological_half-life.pdf
    • https://s3.amazonaws.com/xalexojaxipud/1277207117.pdf
    • https://s3.amazonaws.com/gagotaniwipure/nice_guidelines_antenatal_screening_quick_reference.pdf
    • https://s3.amazonaws.com/vavejijitatofu/55936318394.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab3.bin
2185559c31699d77149316261d2dc7f1f05fc4c2707e2d4521b906bcbcc762b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 5488 bytes
font_01_sfnt_off0000ed75.bin
c0618513d946f8c67e01243956bbfead77ffbe8de695a29ed135817056fc793f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 10028 bytes