Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0eb888c2710f7d8…

MALICIOUS

PDF

80.2 KB Created: 2021-04-17 09:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7901a32b594fbabe0144304d8cd16145 SHA-1: b79a1b4d1a89c2a289a71e1aa57185f0aaab654b SHA-256: d0eb888c2710f7d8b49c1c68b95411dc64fc3cd6e53a2ef452fa2ed797c46875
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a significant number of external URIs, with 30 distinct links found, many hosted on disposable domains. The primary purpose appears to be redirecting users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://botokaw.ru/strik?utm_term=ejercicios+de+gramatica+ingles+pdf PDF link annotation
    • http://barcaporirternet-interbank-pe.com/95387212034nof7m.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/wetenibigulus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff300f9f1675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_60139adaba8d0.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/igghYdX/funny_popular_ringtones_app_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fd8efd9acd7a.pdfIn PDF document text
    • https://cdn.sqhk.co/zolususux/STyijZu/joxex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_6017b8e319f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/hiJieha/42494886034.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/iiueMMX/34146900826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_60542cc137c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6049e45c2ca04.pdfIn PDF document text
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/6398702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_604797aba36aa.pdfIn PDF document text
    • https://rajuvafawomok.weebly.com/uploads/1/3/4/4/134455823/veguwaj.pdfIn PDF document text
    • http://maykistore.ru/417450037657zhui.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_604b0d4b6065e.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/2792810.pdfIn PDF document text
    • http://sesalon.xyz/17464409698aldsp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_603c5a8977155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456387/normal_602d4493627f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_600c210a0f7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390074/normal_6004c6219981e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_60176e8c7fb38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fe8cca6e5f29.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/watipe_demurawaditov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 5508 bytes
SHA-256: 89aecdc229ac255da165b0ed8f9cc19a0b006f3cd46d6f6d6bb15c311db0ad93
font_01_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 11532 bytes
SHA-256: 7531cd954573b76cc56764e2f54b2b93adc38ece925337ba0854518dfea8670e