Malicious PDF — malware analysis report

Static analysis result for SHA-256 746e9ed15dfc2dac…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 09:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d0626387075426a3d22dd2b65bf9c772 SHA-1: e66afae9d52be002aa2da634908ba0e32ae8b33e SHA-256: 746e9ed15dfc2dacd3528f9d65b5895654a469f7a31e5e3f60d997ab5c7e4fc0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially corrupted, suggests a lure related to 'Ejercicios de limites indeterminados resueltos 1 bachillerato', indicating a potential phishing or malware distribution attempt disguised as educational content. The presence of external URIs and link farm characteristics further support a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=ejercicios+de+limites+indeterminados+resueltos+1+bachillerato PDF link annotation
    • http://vilopeg.xyz/netflix_gift_code_hackq96kb.pdfIn PDF document text
    • http://giocodigital.fun/personal_safety_alarm_necklace518vg.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/JeljbEG/tafid.pdfIn PDF document text
    • http://tuimag.ru/lututomawojegujowifedoucxy9.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/tivenetadik.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/icPii4p/run_2_unblocked_games_24h.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/ad70efcf7e05889.pdfIn PDF document text
    • http://hamsterbig.com/antistasi_dedicated_server_guide5kht9.pdfIn PDF document text
    • http://hallhq.xyz/formal_languages_and_automata_theory_definition2d70j.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/nijinevoso_mutusav.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/heZagBB/pubg_mobile_metro_royale_tips.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/21995f15.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/Efjbhg4/86473224174.pdfIn PDF document text
    • http://zootime.store/wujibogomakesoligamufa9yx5h.pdfIn PDF document text
    • https://kopigipovivon.weebly.com/uploads/1/3/1/4/131484029/2984683.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/zezuwutevilekelijuji.pdfIn PDF document text
    • http://romeita.fun/wamopojixanetunaxegw8o7p.pdfIn PDF document text
    • http://esmoney.site/lulumexalaligoxat17sq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zurovajij/33258686145.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/nelozajosadikamepax.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/baby_girl_names_that_go_with_emma.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/64609616624.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 5288 bytes
SHA-256: 017c5e5fba0a7ebbd5464b23866b44e7d8eeef182076b05a14831d7039d9c89e
font_01_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 10920 bytes
SHA-256: 8741910865c148c7021c43ee3eb17ab6cca246d76143d05ee877f872880fbf2d
font_02_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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