Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11a4c8d92a37c36…

MALICIOUS

PDF

74.5 KB Created: 2021-05-10 07:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de81dc3e2ae2190d4619c114b4e1d43 SHA-1: 27293fbb410ba39778159ba2bca6b4060ccc7f9b SHA-256: c11a4c8d92a37c3628e128b8d69bcd8dc2b11228f9c1a20f910f8f8a9653c3d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the embedded URIs, 'https://pelibifir.ru/strik?utm_term=casio+illuminator+watch+sunrise%252Fsunset+world+time', suggests a lure related to Casio watches. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=casio+illuminator+watch+sunrise%252Fsunset+world+time
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/6270784.pdf
    • http://detonicinitalia.website/tajubijuwixusutane6jo3z.pdf
    • http://rofuxipof.mywebcommunity.org/icao_annex_10_volume_iii.pdf
    • http://geleostone.online/how_to_cite_the_kjv_bible_in_mla6ep1u.pdf
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/3d30ff42.pdf
    • https://cdn.sqhk.co/riwifesineji/iahdhey/94920472468.pdf
    • http://4kuhd.me/mystic_messenger_707_route_day_6d794c.pdf
    • https://cdn.sqhk.co/tivinarafuvu/ympSibU/47623910502.pdf
    • https://cdn.sqhk.co/fapiwejagiz/oiYjdji/civil_war_battlefields_near_lexington_kentucky.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_2ab69edd263d4bf08807c1ec77029f6c.pdf?index=true
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_e22e549dc33d447999983a1066e9fb41.pdf?index=true
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_e997393b292b431087cb6e2b0b2124ee.pdf?index=true
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_92ea73ec746e411d95d8dcc5a26dd2e9.pdf?index=true
    • http://vusedew.myartsonline.com/buvotivivumalubetuna.pdf
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_8cfe680ca8b74509a200e86a091afaef.pdf?index=true
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_5cd715de7bc24d548db3e5ffea431685.pdf?index=true
    • http://gototura.myartsonline.com/samuel_beckett_bridge_at_night.pdf
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_7bff667da75e4a19b61f6a6fb2b6aabf.pdf?index=true
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_ef83c41c825e41199d58a671fe1c9659.pdf?index=true
    • http://pelebirepopo.onlinewebshop.net/jadefifik.pdf
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_99eeb63541294e989898d979eb7a923a.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_off0000e3e0.bin
6389a17f195e1ce63d3eabafb7a3660cf18f032f96bddaa3920101751d1abc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5212 bytes
font_01_sfnt_off0000f57d.bin
f1b45302821b86b67c12f6e96ba881154097e83f9f90bfb2e3323133ba48ba49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10920 bytes

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