Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b198ac8e1c6d025…

MALICIOUS

PDF

98.8 KB Created: 2021-02-22 01:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5d5cce74d30fa34a6b286cd524ef1202 SHA-1: 1b9ba38b59198b61231f76325d9120569911dddd SHA-256: 5b198ac8e1c6d025d04b7ac200a1ad99570859a37169c54c8a66c2ebb2063657
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to an "F0 error code on gree mini split", suggesting a lure to trick users into visiting a malicious URL. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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/strik?utm_term=f0+error+code+on+gree+mini+split PDF link annotation
    • https://cdn.sqhk.co/dukizukijire/hfTBL0d/23662914052.pdfIn PDF document text
    • http://tazijiga.22web.org/ibps_character_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/1hjhcy4/chase_mobile_check_deposit_problems.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_601a7224a48f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_600bfcff5853d.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/egjOO24/fozibexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_602776d89198a.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/PmibggI/48582783772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_60303f3dc4d14.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/YmhhQjc/1983177498.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/hjf4OEv/kobopomapifokutawe.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/7ijDgc8/vomit_comet_price_uk.pdfIn PDF document text
    • http://woxotiwewezoba.22web.org/34861091376.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/1Cgj6ig/tegerulikabapezizanim.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/jihghtv/movie_flix_hd_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/iCNAWjd/fitbit_charge_3_bands_fit_charge_4.pdfIn PDF document text
    • https://cdn.sqhk.co/wikikifigas/WggqXha/smartmusic_login_join_class.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenomidesedi.rf.gd/sqlite_android_insert_multiple_rows.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/52748663461.pdfIn PDF document text
    • http://fipaliwabalutu.rf.gd/latex_template_phd_thesis_mathematics.pdfIn PDF document text
    • http://wubexemetaxoru.epizy.com/aalco_aluminium_data_sheets.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_off00013f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1E 1872 bytes
SHA-256: 223568fc15723d408f00056d2cf6bf73ec0b5e81a44ab038b8d55cfaeb1c3c3d
font_01_sfnt_off00014811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14811 5280 bytes
SHA-256: 6a1877e7a582bafb6802fcc1ef1525aea2dac1668905c28a2a67a35df55b3c67
font_02_sfnt_off000159f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F6 10108 bytes
SHA-256: a6af7fd6d85205d6610b60860d25cd1cf24c1e5262f8d710bfa7eca4ac184bef

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