Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc47ec25a289c66b…

MALICIOUS

PDF

88.7 KB Created: 2021-02-23 04:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 74ae18b23f637dc5d83e478880b743a3 SHA-1: 8134529a3497764be905f1f53d585fbbd18d6ac6 SHA-256: dc47ec25a289c66b14f9300a3f8a2fd4e6cb890127ccc38861bd694a1e204529
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a lure to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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=project+management+professional+%2528pmp%2529+certification+course In PDF document text
    • http://vertigoa.online/street_chaser_gamel6ecg.pdfIn PDF document text
    • http://takipleskazan.org/49921813255pzd4v.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/ibopSgd/49663050703.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/djhicN5/golf_hitting_bay_in_garage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_601b69856970f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500186/normal_5fcb6a57a7b37.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/MRidnhj/lisisogipenajujelo.pdfIn PDF document text
    • http://detonic-ordina.website/how_did_germany_increase_its_power_in_the_late_1800sla03l.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/jghjibw/29188477423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_600dadf7b55ea.pdfIn PDF document text
    • http://load-bcp.com/igcse_ict_computer_networks_worksheets1e9p3.pdfIn PDF document text
    • http://copriyghtconfirmed.com/oracle_database_gateway_for_sql_server_12c_download2wwpr.pdfIn PDF document text
    • http://eeuuurrrrr.space/angular_formgroup_array_examplenax4n.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://julizut.rf.gd/lexujetusopufezunapumupi.pdfIn PDF document text
    • http://jiporiri.rf.gd/10838155110.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/62092299839.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/armitron_pro_sport_40_8417_m1179b_manual.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_off00010e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 5448 bytes
SHA-256: 22f7bc5dbe28523371a9a35b947d116c26ef5b2948dc661b07e5660b94ea93eb
font_01_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 11044 bytes
SHA-256: 47e3ff472d0f3be4b581c23af9e16f3a040f7caeef6b8c2b976a8ca8c0d79e32
font_02_sfnt_off000146b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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