Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da991ae2a680f74…

MALICIOUS

PDF

72.0 KB Created: 2021-04-03 10:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a6de6d0a0895d7e8f9071f09c5aa5eb6 SHA-1: 7066f1783e701e9588611e6024b73ac708a6977b SHA-256: 5da991ae2a680f7439b434a04b455f375949549d49090ffec7d38f36af3ac1c2
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 0.9996

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://dugedepap.ru/strik?utm_term=pharmacology+for+nurses+textbook PDF link annotation
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/mifikovugalob_jatuvenunoxixim_gibinitebov_lowilasejun.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/crooked_kingdom_collectors_edition_india.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/dosagilamazukepov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499958/normal_5ffd0b211c7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_60355caf1aa98.pdfIn PDF document text
    • https://xuwaxubefoju.weebly.com/uploads/1/3/1/0/131069763/biresu.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/nanuze.pdfIn PDF document text
    • http://fiwupejebibogu.sportsontheweb.net/python_business_intelligence_cookbook.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/buvosu_lonigilamigub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_605ef33c86eb7.pdfIn PDF document text
    • http://fanuvazav.scienceontheweb.net/oral_presentation_rubric_elementary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_601131cde2318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409409/normal_601813a64e653.pdfIn PDF document text
    • https://wunabigoji.weebly.com/uploads/1/3/4/8/134891590/bd96b.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/lotifobizukiki_temogakisov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://falariwupap.myartsonline.com/90394910240.pdfIn PDF document text
    • http://panexorumilogim.myartsonline.com/best_reader_for_linux_mint.pdfIn PDF document text
    • http://zoxarulal.rf.gd/ldr_sensor_module_datasheet.pdfIn PDF document text
    • http://rogomore.myartsonline.com/famous_guardian_personality_types.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/ansys_18_help.pdfIn PDF document text
    • http://najijojovigom.myartsonline.com/chipotle_allergen_menu.pdfIn PDF document text
    • http://sajonagot.rf.gd/fadujofesexetereron.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_off0000dc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 5668 bytes
SHA-256: a07d7a55a28a4408a69f932e3ef1e974ad916add225e7ad2972bafeaa421a74c
font_01_sfnt_off0000ef88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF88 10248 bytes
SHA-256: 8ae62ba99f4abf045587d5caf92c7692eb50150f9c876573a9bcdb367b7ec5de

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