Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf524d82c5eef4cd…

MALICIOUS

PDF

79.8 KB Created: 2021-06-07 08:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2f950743ae4c04f90c0ab67ac2884362 SHA-1: 9528e955f81fd127307dab5d3718f77cf49b141f SHA-256: cf524d82c5eef4cdf30b63d6fc6b41f6454dab7334d30c24400d73eb62b241b7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, with one specifically pointing to a URL that appears to be a lure for downloading an Android application, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the classification as a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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://irlanc.ru/pbw?utm_term=sony+cinema+pro+apk+for+any+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384029/normal_6025c6a80905f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_6013933e90862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389820/normal_60267b9134414.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5ff9c8515e8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_6018cac73754a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_60451dda7a8df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6023f9e4c9330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461219/normal_605fa7fb58f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_6015443c8494b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_60028e07aaa52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_606a8f9ba1d56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_5ff7c3224df48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_603524f817c65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5ff779eb78714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443574/normal_606e2009b1a0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_600f9affbc06f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5ff95218ddfc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_601a1354d8ed8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc93f2b1a102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatunam.pbworks.com/f/88619507994.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144551772/86492119068.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144678624/list_of_electronic_components_and_their_functions_ppt.pdfIn PDF document text
    • http://pewudomame.pbworks.com/w/file/fetch/144621174/zudarakirowilo.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144422139/tableau_server_training_ppt.pdfIn PDF document text
    • http://keborekudud.pbworks.com/w/file/fetch/144726828/ejercicios_de_voz_pasiva_y_activa_en_ingls.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/w/file/fetch/144543789/votezisopuxaneta.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_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 5360 bytes
SHA-256: bcfcc53b20e624bce5cc31169295214975ddc21585c88e8962781e1182285677
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 10484 bytes
SHA-256: 0069c5bed36704b4a755754cb4957c94490a39576158a167befbf7fb96fcf29d