Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b0cde24facd3c5…

MALICIOUS

PDF

73.9 KB Created: 2021-03-16 06:38:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec862ba66e2f236a3a7cf57f09771fbf SHA-1: 7064d1e8091b6dc4402a2bb13999968db290311c SHA-256: e4b0cde24facd3c5320d48a10afa28d942a303b222a1e062a49e06edf8a07677
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm or SEO spam, containing numerous external links, one of which is a direct URI to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit user curiosity or search engine optimization tactics to drive traffic to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=rurouni+kenshin+episode+guide+filler
    • https://cdn.sqhk.co/rojarimeg/jejjLv5/pokemizaviwal.pdf
    • https://cdn.sqhk.co/bonosexov/fmIUh2k/kiki_s_delivery_service_netflix_canada.pdf
    • https://cdn.sqhk.co/sogunixe/hbsjjpU/rededivupibizosusixuba.pdf
    • http://italiahot.space/why_am_i_so_slow_at_thinking7mdo6.pdf
    • https://cdn.sqhk.co/noluxokeruma/jArjdc6/cigarette_daydreams_sheet_music_piano.pdf
    • https://cdn.sqhk.co/xikokopek/fqkphep/72500281350.pdf
    • http://fresh-ita.fun/37179940108cal99.pdf
    • https://cdn.sqhk.co/romilononove/Aohfzeu/33717961733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2f476a03-26ec-4a51-bdd3-75b44f6a07bd/white_rodgers_1f78_wiring.pdf
    • http://leranijaw.rf.gd/keurig_k4000_spec_sheet.pdf
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_5b266d390865417a9f2b2ba906031539.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_754e8fbc8f604d34aa175b925cfb0b79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c65d929c-20a9-4f01-aab9-9d05d2c35337/celtx_vs_final_draft_2020.pdf
    • https://uploads.strikinglycdn.com/files/8e2ee857-20b7-4fc5-9c2c-5307d82d4429/what_is_count_olaf_to_the_baudelaires.pdf
    • http://satelit.rf.gd/16043556218.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_970a03f5fbac4e9db981ff60d8a2a507.pdf?index=true
    • https://uploads.strikinglycdn.com/files/96716997-1d72-4877-9f1a-067c615d4775/gifefizakoxipekaluti.pdf
    • http://vekabibazegak.rf.gd/67191519382.pdf
    • http://jepatejefa.epizy.com/drenagem_linftica_manual_doi.pdf
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_a1630d682aed464bb42601e40ef8aecd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/743f4987-b89b-4110-9d59-b2346f23fa71/comparatif_et_superlatif_anglais_5eme.pdf
    • http://volajigatume.epizy.com/amulya_dj_naa_songs.pdf
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_cec042a4bf984c77859d802f7ac1535d.pdf?index=true
    • 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_off0000e4cf.bin
73404ff79bd985123112036d75cb8690678cb69fc78b7a20dac3a8b1e2ee0ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CF 5164 bytes
font_01_sfnt_off0000f665.bin
14846e26f44b222f5feff4ed21e8c8f322f9aca32a997412d5ffca505e0b20db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10508 bytes

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