Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d75146c5059736…

MALICIOUS

PDF

79.1 KB Created: 2021-03-03 03:54:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9f0719219a51431b2a586ee95a8fd881 SHA-1: 8c0742b18b1730fc70b6fa257c5d58cec6fba66e SHA-256: 31d75146c50597369e40cedc102a4c5ec5e9e81145d8fa10c623348682a68112
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or low-reputation platforms, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=what+is+it+like+to+have+a+terminal+illness PDF link annotation
    • http://vatidenow.medianewsonline.com/el_proceso_de_investigacin_cualitativa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_602c224623793.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/basic_english_worksheets_for_adults.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/4d5cf3fa.pdfIn PDF document text
    • http://lufafemazivug.iblogger.org/hp_elitebook_2740p_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_603d60b95ceb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_5fdc393b1d191.pdfIn PDF document text
    • https://kimilofu.weebly.com/uploads/1/3/0/8/130873947/6437448.pdfIn PDF document text
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/1019225.pdfIn PDF document text
    • http://freehookup.xyz/pablo_neruda_poemas_de_amor_largosrqf56.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/fantastic_mr_fox_film_streaming_vf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_60006b72c9561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molodetagako.epizy.com/powerstation_psx3_compressor_not_working.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/2984564483.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/12925552658.pdfIn PDF document text
    • http://bobofipiki.epizy.com/370094565.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 5064 bytes
SHA-256: 1871297547f300ab03b191090b393be8b45ecf28c548cb53fccf1e287ce3852f
font_01_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 9972 bytes
SHA-256: 1a6aef5e4aafd144bd37809201a68031b706201b8b9fa8efa01990aa951fb8e4

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