Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b1dc243db4f5a87…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 18:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 976ccf6fcb988a48792aa1a318ae21bf SHA-1: d14422c889edf3373bd159d1a58792dbd03a80a4 SHA-256: 6b1dc243db4f5a87b029bc9522b36a3e6eb6f5415d634f07aef01c5842ba93e4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/strik?utm_term=craftsman+garage+door+opener+wiring+manual PDF link annotation
    • https://cdn.sqhk.co/vefapatape/ggsijjh/xiposurit.pdfIn PDF document text
    • http://mjawebdesign.net/how_to_calculate_face_velocity_of_fume_hoodt5iyi.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/fghdGxh/jonathan_prince_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/fhgiahe/50853334017.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/iijhH6s/wojna_polsko_bolszewicka_krotka_notatka.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/9IWmjdw/17361302356.pdfIn PDF document text
    • https://cdn.sqhk.co/luvuxokam/cgiic0o/puwigese.pdfIn PDF document text
    • http://sodaapp.club/swf_embroidery_machine_manual7mzzh.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/13jeNsC/pekka_kana_2_android.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/YgcN5id/dwayne_haskins_trade_destination.pdfIn PDF document text
    • http://art-practice.org/nokup6430t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/osrs_slayer_monsters_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/7232785273.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/jekoraw.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/73395502359.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_4aa08b65a9d849728ef748aaaa5052a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/exponential_and_logarithmic_functions_test_answers.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_bda787b12e1b4082a2c545fdfda09500.pdf?index=trueIn PDF document text
    • http://saxarivoje.onlinewebshop.net/normas_de_dibujo_arquitectonico.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_4fa7be0f65c8477fa33aa64b1d698ba2.pdf?index=trueIn PDF document text
    • http://lukafimagog.atwebpages.com/kiwofu.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/anatomy_of_a_frog_worksheet.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_471e5bf82bd44c41988e32aeac5864d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/wiat_3_score_descriptors.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_b0bde3c643e94ac882a308a5dfdfa583.pdf?index=trueIn 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_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 5356 bytes
SHA-256: e9387552198687f1b78313ea46112638f132bfc52672c9c0cf55f716bb6d1c80
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10908 bytes
SHA-256: d985036215ec991a52c69ba35ea5f8569251c03ee4a1558fb7b038014f956438