Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b0e9faa6848890…

MALICIOUS

PDF

72.3 KB Created: 2021-02-07 05:15:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c087d2216b0561f1bdb4b8d0c7e912b9 SHA-1: 4205a5ba169a6bbade87c1e23039987732b1b2db SHA-256: 83b0e9faa6848890a76640130ea6e4e8fb7c56a23ed52955bbfabfc27d558056
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=opera+browser+apk+android+4.+0.+4 PDF link annotation
    • http://psylath.com/supupazanatexisepil05.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/5Viigid/cheat_rollercoaster_mania_mod_apk_unlimited_money.pdfIn PDF document text
    • https://vojituletakez.weebly.com/uploads/1/3/0/8/130874409/mezerewegejef-zikoximebexixuz.pdfIn PDF document text
    • http://creamwalls.online/40895188167y6h6r.pdfIn PDF document text
    • https://vawosogujatu.weebly.com/uploads/1/3/5/2/135293246/pesapadunixijaf.pdfIn PDF document text
    • http://tovelksa.website/mevovisujuvewovibatimag883np.pdfIn PDF document text
    • http://lovechat24.club/mobile_data_automatically_turns_off_for_some_appsptfkb.pdfIn PDF document text
    • https://jidevamomibowi.weebly.com/uploads/1/3/1/4/131437101/8670018.pdfIn PDF document text
    • http://cooldomen.space/apostila_para_aprender_ingles_inicianted6yue.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/2Ahgii4/63357514906.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/igggffE/webtoon_unordinary_episode_198.pdfIn PDF document text
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/5581745.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/xafiliz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napipipazapuka.epizy.com/al_quran_tafsir_by_word_apkpure.pdfIn PDF document text
    • http://molopafefo.rf.gd/barotropic_and_baroclinic.pdfIn PDF document text
    • http://pixokux.rf.gd/38219052361.pdfIn PDF document text
    • http://xurolawewetaw.epizy.com/sound_booster_app_apk.pdfIn PDF document text
    • http://tewufadab.epizy.com/bifurcation_divorce_california_forms.pdfIn PDF document text
    • http://jikokajogov.rf.gd/zinokoribokamifesuzu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 5504 bytes
SHA-256: 1f43c5787e33243b506fbac71be3bf097e051209ea8ec8a056e55df0c1d61a4a
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 13740 bytes
SHA-256: cc4a64f082fdd1b47fe9f10f9dd3068101bcb0df65ff9a36e133c8615b14c534

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