Malicious PDF — malware analysis report

Static analysis result for SHA-256 281421099a38c9fe…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 06:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1fab2c01b16434e929b445a10519b91 SHA-1: c5a17638876181a467508dfebd7a18b192020f44 SHA-256: 281421099a38c9fe2e27abc0f189e02cce58ed69c30275c8e512457cace16477
186 Risk Score

Malware Insights

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

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 6

  • 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.
  • 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://gimoguvi.ru/award?keyword=accidente+cerebrovascular+en+perros+pdf PDF link annotation
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/9079055.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/h8iiejd/video_maker_with_pictures_and_music_free_download.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/jomovosapomesokuke.pdfIn PDF document text
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/pufesipomujegudo.pdfIn PDF document text
    • http://swiss-gear.shop/52505274735cj9rn.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/jifevobasemepapiwivolisi.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/exercicios_de_analise_combinatoria_enem.pdfIn PDF document text
    • https://jugotazotezolut.weebly.com/uploads/1/3/5/9/135973864/vozowulevazof-duxugojib.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/tibazoxupaputipuxem.pdfIn PDF document text
    • https://fatomokoke.weebly.com/uploads/1/3/4/0/134098041/govulimijadukunu.pdfIn PDF document text
    • http://leqqurint.online/76077979366jevio.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/536676644c0df.pdfIn PDF document text
    • http://tikixoji.mywebcommunity.org/basic_english_grammar_book_2_answer_key.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/general_prologue_to_canterbury_tales_introduction.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/9ficjez/livenolelimokawumijumu.pdfIn PDF document text
    • https://tigasedoxopafu.weebly.com/uploads/1/3/4/7/134707490/1994769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dirulibas.onlinewebshop.net/28904814653.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/61555228657.pdfIn PDF document text
    • http://segimoto.myartsonline.com/25609415781.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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 5340 bytes
SHA-256: 8e72f180128a3e6287b53d0da0a400684e70e599691b5d3b0f1c86200112174b
font_01_sfnt_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 11828 bytes
SHA-256: 5e3dfe1351bf8ac73c4a73ff977e0f5eeccd0b82f1abf51ab157b7894c67b7ca

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