Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2c8fd16531660a…

MALICIOUS

PDF

78.2 KB Created: 2021-03-22 20:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f0186ada38c0e430aaaad115ad02254 SHA-1: 52a2622049efa3ea0597dbf3cbe593479d1c03f0 SHA-256: fd2c8fd16531660ae0e8aa8975ed6e147b89b5d8496c42102b56ba3640dbb865
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are part of a link farm designed to manipulate search engine results, directing users to potentially malicious sites like 'kuzutuzo.ru'. The document body, though heavily obfuscated, appears to be a lure related to 'periodic table of elements with names pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=periodic+table+of+elements+with+names+pdf
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/90016a7869bed.pdf
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/8818f2.pdf
    • https://cdn.sqhk.co/vedimurami/hgDhjgA/93867838003.pdf
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/2082499.pdf
    • https://cdn.sqhk.co/derepinejabi/ROhaGha/chirkut_album_song.pdf
    • http://pimifawimonidij.mywebcommunity.org/riesgo_relativo.pdf
    • https://cdn.sqhk.co/fusozuwalas/iqJbOja/numoleworo.pdf
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/zukurop.pdf
    • https://cdn.sqhk.co/tisumusef/KGXiijh/cannon_master_shooting.pdf
    • https://cdn.sqhk.co/xupodafib/OuEXhhG/joker_bgm_music_mp3_song_download.pdf
    • https://mototide.weebly.com/uploads/1/3/2/7/132710683/9771b8b710e9b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ca28fddd-a288-439b-bcf9-16f89e1efc10/sketching_basics_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e4857afa-74ca-4ad7-80f1-83558fd60490/what_is_2_3_zone_in_basketball.pdf
    • http://vutekumini.epizy.com/vofimaxajadobitiwu.pdf
    • https://uploads.strikinglycdn.com/files/07d40e21-6b88-4950-84fa-687493c0ff72/is_2008_honda_crv_a_good_car.pdf
    • http://famomijis.onlinewebshop.net/faduxuxirumobu.pdf
    • https://uploads.strikinglycdn.com/files/60ba2b3a-c2d1-4fcd-99a5-93474c51aff7/45263364888.pdf
    • https://uploads.strikinglycdn.com/files/cb516fd1-72e6-46f8-a6fc-18a89ad63a88/you_never_eat_alone_the_series_ep_1_eng_sub_dramacool.pdf
    • http://tumezubix.epizy.com/wiwoxiwakidevewikomoparof.pdf
    • https://uploads.strikinglycdn.com/files/13d9e38a-aaca-46b8-a437-b179cba87749/masetezakevegewosexadeva.pdf
    • http://ziwibavufu.rf.gd/bojatupixekopamorezogusul.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_off0000f1ea.bin
ab8c2e747bde686a4a52afa207331dc1a2acdcbb0b00b3a72d09c783686d7e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 5628 bytes
font_01_sfnt_off000104ef.bin
77283b7e615f1a63c405c58d6ad27dc72cd3b9c8a5902aba420ae8fe465b8198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 10784 bytes

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