Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d664796b5b0cfc…

MALICIOUS

PDF

74.4 KB Created: 2021-03-17 19:02:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439b5cc9afb63418b4eee8bccf459f1c SHA-1: be5f6602bf768eedc359db0569c0812a733f4a2d SHA-256: 69d664796b5b0cfc51c82ca515bba99835713f89bbd6d3265e15b79a6e27a0b4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm designed to attract traffic or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/award?keyword=mahalaxmi+calendar+september+2020+pdf+download
    • https://cdn.sqhk.co/kerametunal/1Nhj7OL/pets_live_wallpaper_download.pdf
    • https://cdn.sqhk.co/dutaxato/LwezjdJ/aesthetic_wallpapers_anime.pdf
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/734052.pdf
    • https://zotamitogimida.weebly.com/uploads/1/3/0/7/130775261/99bf1baafe82b59.pdf
    • https://rewapukin.weebly.com/uploads/1/3/5/9/135961798/jenudubo.pdf
    • http://fowirunuwajuk.iblogger.org/pisunuwapeloxorovu.pdf
    • http://mejarada.iblogger.org/boletin_informativo_de_deportes_futbol.pdf
    • http://simamopi.22web.org/can_u_get_disney_plus_on_lg_smart_tv.pdf
    • http://lilidabegib.22web.org/kaxataxirup.pdf
    • https://cdn.sqhk.co/zopimoforaja/gCgjggi/64833511827.pdf
    • https://cdn.sqhk.co/jiguluzufuwa/gfoC8hb/bengali_movie_beder_meye_josna_song.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_e4debf1de3d549cebb6aaf11fe52030d.pdf?index=true
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_a6346af9ed184890a12e5f6da358269f.pdf?index=true
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_e41e859b1fcf46d19d31cd9f87b87020.pdf?index=true
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_47264c99b8d74dd9b75a9fda54cd4f38.pdf?index=true
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_31a6794cc0a040d4a83df6627f220450.pdf?index=true
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_c5ad2c8d84764032a5f144d9dd442b40.pdf?index=true
    • http://dadorisisewane.epizy.com/7264554254.pdf
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_51186f0890b844be995560e83a63052f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/77cd34e5-e2de-4000-8c78-b0c1d4c4d62c/kuvumovijagozo.pdf
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_5b664792feea4eb1802adbab105762c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5e6e8fe-e368-4577-8b02-80d7c19d48b0/igloo_mini_fridge_with_freezer_white.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_off0000e43e.bin
256e112332af275ffeaca55268286ab5a64f9b1d91908e287ffbfcdaa360a6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 5972 bytes
font_01_sfnt_off0000f883.bin
f95556d43543638b961bec8f0335cd6875933d92bc6cad12852b788dff4c2614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF883 10492 bytes

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