Malicious PDF — malware analysis report

Static analysis result for SHA-256 9356cd3325c3d07f…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 15:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: da83507c8707e3d26d0622c13774f1b6 SHA-1: 1c2b6d780f3652b479f6c228efa5700b99992ac4 SHA-256: 9356cd3325c3d07f04e64220d191ad8cd474fa5c0baea98aeb8e7ee0231092ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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://baarspo.ru/123?utm_term=ecosystem+services+worksheet+answer+key PDF link annotation
    • http://fupemagis.mywebcommunity.org/jidokimoderibulifet.pdfIn PDF document text
    • http://s7hmus.org/printable_piglet_ears_templateu4ny8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375088/normal_605f37c524a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60496ee8d7d4b.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/modo_congiuntivo_e_condizionale_del_verbo_vedere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_600f72c6609a0.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/15264813461.pdfIn PDF document text
    • http://ulekschool.online/how_to_cook_pre_cooked_frozen_pastaho7oz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_6055f0d73b37c.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/bodhankar_pathophysiology_book_free_download.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/lefebunopunomudi.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/samsung_refrigerator_water_dispenser_not_working_after_replacing_filter.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/software_development_services_definition.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/car_engine_parts_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_bc0478053b2348699d7171c86b81fbe9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/59104b0b-c697-48bd-a36a-0431f386b555/banetumenomugovosalol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50baba42-3b51-4ae0-aa01-5be2ced7202e/37627605070.pdfIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_18bb8992a0084a92ab4d09cd6db807d3.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_a9df587378be4752aed34caee05dc3d3.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_cce1ee28af9e439ab7ad20a0bc01affa.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5284 bytes
SHA-256: 0d46f254c8e8307279dd3552287166f68a25ad5895f817625d708bf5a5fdfd3e
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10536 bytes
SHA-256: 020d9e243c229c4bd36704186b3e436d2c272b3944913304096df0c6eebd5c36

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