Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0394a0770f513f9…

MALICIOUS

PDF

113.3 KB Created: 2021-03-02 01:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de0dd0cc3efd462d0bc8403b80e0d607 SHA-1: 3cfeacac110418c915a206d71897125ed021433c SHA-256: b0394a0770f513f9227c27169aea1b934d7c66855e02d7fd44b0f9b768a688ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/123?utm_term=dark+souls+remastered PDF link annotation
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/xoloxolirorad_zaxudekerato_topewelub.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/b6hdVia/2323512657.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/navepe.pdfIn PDF document text
    • http://wwbook.org/rosiginamiwepafiwe05zbd.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/3693984.pdfIn PDF document text
    • http://springwin.space/61216391744ldwdx.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/Gtjigdt/buddy_throw_mod_apk_unlimited_stars.pdfIn PDF document text
    • http://my-favshop.online/nulutedafopukivem5gxek.pdfIn PDF document text
    • http://midorezif.iblogger.org/go_template_loop.pdfIn PDF document text
    • http://vsedlyatebya.xyz/wifi_driver_linux_kali9xrcz.pdfIn PDF document text
    • http://demegudatodura.iblogger.org/forgotten_realms_wikia_elf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fukepez/faronunodowek.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/86312543557.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/ardaas_2019_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/spreadsheet_for_personal_finances_uk.pdfIn PDF document text
    • http://nedepufeto.epizy.com/gorojidufubumixuk.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_off00016b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B54 6524 bytes
SHA-256: 4f94191ae192fe3fb60ae87c4dd7112e4f6d6c1539b1cca32c93dd5f7c4a37e7
font_01_sfnt_off000181bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181BF 5032 bytes
SHA-256: d74c4abda63828d2ffe824f42bdd7cefc3b32409dfed44d34d1f5f55d59ea3f3
font_02_sfnt_off000192cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192CB 10812 bytes
SHA-256: 1413953b6830d8a15157770ecc0602702639c81590dfe4fe85bf5ad889767128