Malicious PDF — malware analysis report

Static analysis result for SHA-256 5873b9b0ca2806f8…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 12:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc95236b970856cca857f69162760f77 SHA-1: 215f83b852af5991495ea557430bd596a8652d17 SHA-256: 5873b9b0ca2806f8b5d557308cdeb9f586ee6f58e5956ce46336ed10ec3c28d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

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 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://seumenha.ru/strik?utm_term=will+mcbride+show+me PDF link annotation
    • https://cdn.sqhk.co/xixujipum/9hfifji/mimpi_hamil_anak_kembar_togel.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/mipebotoladedux.pdfIn PDF document text
    • http://fbcopyright-center.com/naming_of_coordination_compounds_worksheet31zjz.pdfIn PDF document text
    • https://cdn.sqhk.co/dubagojovo/hPFgcUZ/gojososefudelokujobepobo.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/Thcgeib/pokemon_ash_and_pikachu_wallpaper_download.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/4585547.pdfIn PDF document text
    • https://padilokemim.weebly.com/uploads/1/3/1/3/131381900/kedipato.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/kjfhbhg/silicone_candy_molds_amazon.pdfIn PDF document text
    • https://gebulofafilo.weebly.com/uploads/1/3/4/7/134717894/lilamar.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/d4lP1v5/topup_africa_app.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/fabufonoxananirodu.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/vukujidor/36607230218.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/ek_chumma_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/simple_algebra_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/diablo_3_season_15_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/interpretation_of_romeo_and_juliet_prologue.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/toxapafowulu.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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5212 bytes
SHA-256: 4e4d4b3239ed2d418386398b9af918204f74e76ff463c8ffdb5ec037149e34fc
font_01_sfnt_off0000fbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 13060 bytes
SHA-256: a0827e434554028e4062f9d55d9c6e9e37fe69486fb7577005a67686381c27ee

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