Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabbf2c0be2fc0c5…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 00:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c818eb2d3709df14d415b3974b64e00d SHA-1: d4941778c6458842c385266f1e7df69eab2fb71c SHA-256: dabbf2c0be2fc0c51bd2c3a7803b46d6cc5bb8d5c4d765f97cfec6e78f5deeae
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious link farm hosted on disposable infrastructure. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the link farm nature, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=fg+knot+strength PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489411/normal_603a3df27d982.pdfIn PDF document text
    • http://bigafoporake.22web.org/tosagotevewupunerigodawi.pdfIn PDF document text
    • http://wusazododapir.iblogger.org/37292633485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490250/normal_602f91c5855fc.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/ijidghX/41272568502.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/aG1iajx/saberforge_duelling_lightsaber.pdfIn PDF document text
    • http://mananeje.66ghz.com/how_to_assemble_excell_pressure_washer_gun.pdfIn PDF document text
    • https://cdn.sqhk.co/musezikuzapi/dFcgejc/90596216147.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/el_arte_de_la_guerra_sun_tzu_resumen_corto.pdfIn PDF document text
    • http://senogibe.iblogger.org/the_third_jesus_deepak_chopra_free.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/bezixukakolalesatufaxunab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_6029d2d8ede73.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/8685548771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_789315a899f545998d1cd18cccb77671.pdf?index=trueIn PDF document text
    • http://lipabarud.atwebpages.com/85045653951.pdfIn PDF document text
    • http://mosiwifu.epizy.com/premier_protein_caramel_nutrition_info.pdfIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_4f8cc0cd1238449eb24cecd17cba821a.pdf?index=trueIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_449dd0074ab6499c974ce6f7e338ef86.pdf?index=trueIn PDF document text
    • http://lodonevubepivor.epizy.com/spring_framework_5_reference.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_470a14d87586485ea0e56087ebf1514c.pdf?index=trueIn PDF document text
    • http://dupepoge.onlinewebshop.net/branches_of_accounting_download.pdfIn PDF document text
    • http://pojetol.epizy.com/sazurexeridi.pdfIn PDF document text
    • http://zegotora.rf.gd/jibasekepatabelu.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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 4724 bytes
SHA-256: 64c1178ec58d3d68e73b688193b7d8ac71fcd3fc3b1fb4f04f84ebea50698627
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10628 bytes
SHA-256: f31fac7fbfcb5a1c25d13af4c08a4c79e1f31b96bcb416407fb1a2fd265c5264

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