Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f214ebe3b1125c…

MALICIOUS

PDF

77.6 KB Created: 2021-05-14 06:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d1bbf5433ce236207777b4a50ec25178 SHA-1: 7097ff2a2ba560c605ee00d3c8e26bf08535f479 SHA-256: 74f214ebe3b1125c752f49e4d55b06704dfa8e9c85907d0190dd98de1cd93756
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata related to its generation, but the primary malicious activity is the extensive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=best+online+data+science+masters+programs+in+india In PDF document text
    • http://mofobawosenej.mygamesonline.org/ak_jain_manual_of_practical_physiology_free_download.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/2631498.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/7594ed.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/3285615.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/74484240974.pdfIn PDF document text
    • http://diwolekeku.22web.org/rheumatic_heart_disease_diagnosis.pdfIn PDF document text
    • http://paselon.getenjoyment.net/tipos_de_cannabinoides.pdfIn PDF document text
    • http://xodikiz.iblogger.org/nenuzitogo.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/killowen_primary_school_coleraine_inspection_report.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
    • http://lebodixo.epizy.com/how_long_does_it_take_to_get_over_someone_you_truly_love.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/50592614234.pdfIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_fb44f7bae81d4c8a9b1a3173e40cad7b.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6fa9cdcdb405485abda6a588a66a3fec.pdf?index=trueIn PDF document text
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_2e43102bf85f44319272603b7a425db8.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_fa04544cfd9b497291cc7943f642ca5c.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_f6042ecc05b14a78b71f1ce441957f62.pdf?index=trueIn PDF document text
    • http://kebanibaru.epizy.com/hydrocarbon_reactions_worksheet.pdfIn PDF document text
    • http://nijufunirel.rf.gd/relative_clauses_rewrite_exercises.pdfIn PDF document text
    • http://bavidatesudujig.epizy.com/cipherlab_1166_bluetooth_scanner_manual.pdfIn PDF document text
    • http://zukewanika.rf.gd/91107405597.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_off0000e4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A9 5228 bytes
SHA-256: eab66a2a867a9fe64b3342b293d6bb795b91c33a671188448fdd907dce096f8f
font_01_sfnt_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 10792 bytes
SHA-256: b60c27489cff70d0e346c7df61c7d9dde71af3073762588442cfeec6abd59964
font_02_sfnt_off00011af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34