Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20eb0f714d5b24e…

MALICIOUS

PDF

82.0 KB Created: 2021-03-26 09:14:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3a7e0cc8c4de1e16d2ee38e65763b01 SHA-1: 989b2037a20a82690bdb77e3c2dd97f4203d4a80 SHA-256: c20eb0f714d5b24ef1dfdec3121b5d743c2b7d8c236ad00fd4a3d3d5bd2025b2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/award?keyword=reference+pdf+harvard+style+generator PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fe275d4a17cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_60249dfb7adb5.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/djfgiha/nbc_ct_weather_team.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/bschegc/52401687913.pdfIn PDF document text
    • https://cdn.sqhk.co/tofepojafuz/hjJhcgd/92092277351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_60562494a9581.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/oijggBG/43851320461.pdfIn PDF document text
    • http://bojalusexob.iblogger.org/dr_seuss_sleep_book_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fe9d2f0eaf1b.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/hhi6sO0/smart_goals_definition_nursing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_bdae80f434984b58984c011e3f3d03bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/96958801343.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/moment_timezone_format_options.pdfIn PDF document text
    • http://pikowejinaruwut.rf.gd/89896986252.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_4de5bb66a84d4e748302c8341722ccdc.pdf?index=trueIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_a2a46686058e47729e7d754865ea5a10.pdf?index=trueIn PDF document text
    • http://jeneviwa.epizy.com/zevixuwar.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_8058c350f5344454a0f66be36e8e1f85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/10389222739.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/47423385819.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_f59d044d9952427cbb890f3942ce9a1f.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_b95d12b1400c4dbe916b5e0488e84948.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_f35357c9c4de437497bc9454c86c417a.pdf?index=trueIn 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_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 5588 bytes
SHA-256: bbf8d1e7bc51ead46153b19a5e4815dc39112c70d163fe13c1ce09e637e7c384
font_01_sfnt_off000114d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D8 10920 bytes
SHA-256: b87b0ea6698c4db234a52d6b91c07d80e7f2c9f5d082bd9855a2dd061dda0ee7

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