Malicious PDF — malware analysis report

Static analysis result for SHA-256 224dca29eb5cd191…

MALICIOUS

PDF

80.1 KB Created: 2021-02-25 15:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d1d98f2eb79f1f12396c4a9b4e9ef38f SHA-1: cc88be2b6cd89b5fd84dfe6195e0df8b34a2a839 SHA-256: 224dca29eb5cd191b653908819eeda0885c4c692a3b70bc7d41a1a6f6f600567
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 ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'theoretical framework in nursing research examples' and 'wkhtmltopdf', likely a lure to disguise the malicious intent.

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://jottigo.ru/strik?utm_term=theoretical+framework+in+nursing+research+examples PDF link annotation
    • http://my-favshopg.online/is_bernina_the_best_sewing_machine6m2jx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498882/normal_600d660d6864c.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/5268664.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/rilijazu.pdfIn PDF document text
    • http://jakor.pro/83435498063gn3o4.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/velupatojodozuwa.pdfIn PDF document text
    • http://top-agent.ru/63950529057uqrgv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_601012c1c6800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424630/normal_5ff7767591953.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/difidepa.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/chinese_calligraphy_worksheetsabvb0.pdfIn PDF document text
    • http://afracheat5.xyz/rmlau_syllabus_2018lrf7c.pdfIn PDF document text
    • http://fullpisetc.ru/jbjs_reviews_author_guidelines4i97h.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/lolaritemukole/74749518988.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/46237532512.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/kovetenimosigesonaton.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/google_analytics_for_android_and_ios.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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 5600 bytes
SHA-256: dcd80dbd842cccc6953fbcbeefc87b2b99271b36c665c219d05d2aefc7bc201d
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 10872 bytes
SHA-256: 91ebed5ca6d8863f928578947cbb80855d0e31b7e82ee13e94d378b7765ce80a

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