Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb66aa75b0d25f0…

MALICIOUS

PDF

77.3 KB Created: 2021-02-28 15:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11cb1694936e9789d35e4377dd7f53d3 SHA-1: 5f6421d9eb9b1e5c6ee7910af96b85c370744ba7 SHA-256: ecb66aa75b0d25f05c69d2d69254a6597ee22efe4e6767b7c0b98857590a4b9c
134 Risk Score

Malware Insights

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

The file is a PDF document that contains embedded URLs and is flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=nikon+8496+p-223+3x32+hunting+scope PDF link annotation
    • https://cdn.sqhk.co/tivaboloxome/haaYUia/85880411327.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/tie1ewj/dujimavegut.pdfIn PDF document text
    • http://xawaviki.iblogger.org/74787066151.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/jggdcm1/17324510511.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/RiaieYq/fernanfloo_saw_game_descargar_gratis.pdfIn PDF document text
    • http://jijexuvekenim.iblogger.org/programming_interview_questions_and_answers.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/4217304762.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/bisazabe/adobe_analytics_debugger.pdfIn PDF document text
    • http://gotazuvibidok.epizy.com/b._ed_admission_2018_online_form.pdfIn PDF document text
    • http://kobizesamow.rf.gd/jupezudok.pdfIn PDF document text
    • http://nilovumilof.epizy.com/lekar.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/38335604225.pdfIn PDF document text
    • http://zusobudem.epizy.com/candy_crush_soda_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/75363699719.pdfIn PDF document text
    • http://gebutetivifupa.epizy.com/85061842082.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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 5880 bytes
SHA-256: 9ec1dbd9f78b8b2582f47a19b87c978e8cffc71c7e059c5cc2453be71920fa81
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 10944 bytes
SHA-256: 0da3bcbb7ee798f91f31d91a99b4e4697b1f0e161f4ec67acc5582981c4a2733

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