Malicious PDF — malware analysis report

Static analysis result for SHA-256 6503e1af5cbe5442…

MALICIOUS

PDF

87.0 KB Created: 2021-03-01 22:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5f631c26f281dd7e34298bc0475e508f SHA-1: 72d4e2afbb127a527559c6bb710ada645440ef63 SHA-256: 6503e1af5cbe5442152defbbe3198d8a7b93fe6c48468714b8e37666adfec0c0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including 'kuzutuzo.ru'. The ML classifier also strongly indicated maliciousness. The presence of these links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://kuzutuzo.ru/strik?utm_term=do+dunkin+donuts+have+frappuccinos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5fcd80ff3d9ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486206/normal_5fc9314aadd0c.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/fhhKjiz/sound_effect_dj_stop.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/ijiaXii/80470107386.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/how_to_connect_polk_signa_s1_to_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/qMDjh9J/like_app_videos_download_share_chat.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/fepenobokaz.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/iehibPH/meepo_city_rider_2_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_5fd3164710a95.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/234a9320f9e9.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/xoredematoti.pdfIn PDF document text
    • https://kifakujokaw.weebly.com/uploads/1/3/4/7/134709271/1643590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602eaacc411a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_6015cc912aeab.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/zidenigad/payaliya_bajni_lado_piya_song_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/simple_compound_complex_sentence_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/21930016489.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/42192668555.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/votadisabep.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/sorimusosedutokapubelejit.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/lijomamujoramukero.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/gaki_no_tsukai_batsu_game.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_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 5336 bytes
SHA-256: 24299766cde23dc03d29878dc5d06235e09246bfab8f5795ae1f4024aabc05fa
font_01_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 10996 bytes
SHA-256: f4c123bde89089b58ff31b863602dee7774567be12da8e2d4721a1768778d0cb

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