Malicious PDF — malware analysis report

Static analysis result for SHA-256 f460e0992a0f4d1f…

MALICIOUS

PDF

79.3 KB Created: 2021-04-01 11:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1aa8120141954c89a2e23b054ac66e0 SHA-1: 932b5426055cdcae27bb144fe262c4a7831ebf0c SHA-256: f460e0992a0f4d1f9844f21af761e5bad6fe67e24c78b7b1c5788e3e7e62c134
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a "PDF_SEO_LINK_FARM", directing users to various websites. One prominent URL, 'https://xezojetit.ru/award?keyword=normalizacion+de+base+de+datos+ejemplos+sencillos+pdf', suggests a lure related to database normalization examples. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the extensive linking pattern is characteristic of SEO poisoning or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/award?keyword=normalizacion+de+base+de+datos+ejemplos+sencillos+pdf
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fdd6979cb91f.pdf
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/532898.pdf
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/rokusimag-buvar-xusekapokimuzin.pdf
    • https://cdn.sqhk.co/butituguxur/jaegfY3/rusty_cage_halloween_knife_game_song_lyrics.pdf
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/gudemirukaxiluse.pdf
    • http://fajikiviwakux.22web.org/75724562002.pdf
    • https://cdn.sqhk.co/vovewotutal/ZoZghGt/pitbull_dog_wallpaper_for_phone.pdf
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/mozudivob-rasagizusufejog.pdf
    • https://lidovoji.weebly.com/uploads/1/3/4/3/134313359/7147457.pdf
    • http://vabakavolageni.22web.org/lefolanumakere.pdf
    • https://jesofoxera.weebly.com/uploads/1/3/1/4/131407857/0cd21246badb.pdf
    • https://static.s123-cdn-static.com/uploads/4403824/normal_6003e76289b0e.pdf
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/0f877bd9.pdf
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/7088041.pdf
    • https://cdn-cms.f-static.net/uploads/4408188/normal_601be4861696b.pdf
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/xakabavo-vilowubotukuju-kapubageki-zamelosebivefib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_72cb63a55e234aefa29160a3621828dc.pdf?index=true
    • http://fosekor.epizy.com/basic_active_directory_interview_questions_and_answers.pdf
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_0fa0aab7f6134b8faade87943e07a260.pdf?index=true
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_3eb97a7723fc4417b9543de25fab4978.pdf?index=true
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_50aee7db372445d5bb85ab9d5237bf4f.pdf?index=true
    • http://divifafapinuk.rf.gd/crystallography_reports_wiki.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_0832079614cc4f7e862cff7281dfe0db.pdf?index=true
    • http://pasadoru.epizy.com/spotify_free_premium_apk_ios.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fc.bin
204cbe52134ee8892ee62cc385e973b80e07eef5a9613fba629d6713be8c5399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5324 bytes
font_01_sfnt_off0000f8fd.bin
976e358a0b26f8a63b7fe190799009a20267ec6f2639ef4ed485c768be2857ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 11876 bytes
font_02_sfnt_off00011f5f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 4324 bytes

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