Malicious PDF — malware analysis report

Static analysis result for SHA-256 152e1e6606662502…

MALICIOUS

PDF

79.3 KB Created: 2021-04-10 09:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: da00e0ea301d4f8438243f1cb8e61187 SHA-1: dd25da17e4f69965631a9d2f030488a659980660 SHA-256: 152e1e660666250242389aba47866644d25fc0efb3a0fd6493a5ca2a90c1b5d1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=the+logical+indian+review PDF link annotation
    • http://bulibujirifubof.scienceontheweb.net/gubarigiba.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/giibi6W/50876618934.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/36836707060.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/4109879.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/mhbhfjc/download_call_of_duty_mobile_garena_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/naxusepimosa/kopidqX/2048_unblocked_hacked.pdfIn PDF document text
    • http://nowefewafugaki.iblogger.org/biochemistry_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/rokunufoleti/Micjaie/tadivafenedotemigamaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/oljijhe/77580994778.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/5fba402.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/addis_ababa_university_masters_program_entrance_exam_2020_19.pdfIn PDF document text
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/2310534.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/stihl_fs_56_rc-e_line_size.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_a89c075eecdc40fd8f1538d8e8bc9416.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_781ecd3b3677409e852c2886721140a3.pdf?index=trueIn PDF document text
    • http://wonanikapudidak.atwebpages.com/website_to_app.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/7340748437.pdfIn PDF document text
    • http://jiminoxesovibin.epizy.com/lg_4g_phone_price_in_bangladesh.pdfIn PDF document text
    • https://5121d360-3808-4f61-aa44-d87cf2d9d428.filesusr.com/ugd/032e8a_1bd5ed74de15484b85b2a9a24ac30140.pdf?index=trueIn PDF document text
    • http://kuwanuzoniwod.rf.gd/rebelion_en_la_granja_libro_sinopsis.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_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 5124 bytes
SHA-256: bb368a3bf2c2b3fc8401c79e4532b07a751cad754855350bdd7bc1b183a788e4
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11176 bytes
SHA-256: f508ab2c8feccaa8dcccecaa2cf0e101c93a0669e4a7239360fa8cfafe52a8d2

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