Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e8a4510931ccb7…

MALICIOUS

PDF

74.5 KB Created: 2021-03-06 07:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 09127885c34d83282563319266201398 SHA-1: bfb97862bb088af468fe606021654ec06c5d1a42 SHA-256: 28e8a4510931ccb77bce269a2324d32ec02ca461b52a15a558d070402f34fe17
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF documents. The presence of multiple links on disposable hosting and the ML classifier's high confidence score indicate malicious intent, likely for SEO manipulation or to distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

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://ponafet.ru/award?keyword=marketing+management+kotler+keller+pdf PDF link annotation
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/potopagegabut-ditumipupugogoz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/eidCOib/gegelomiruw.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/2937038.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/NhfjbGn/77176621946.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/hfiaEje/visivuxabevov.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/024137aa611e2fe.pdfIn PDF document text
    • https://wubugijesagaro.weebly.com/uploads/1/3/1/4/131437106/wuxuf.pdfIn PDF document text
    • http://lomigizukifomor.22web.org/64995566667.pdfIn PDF document text
    • https://fesunoxatufaf.weebly.com/uploads/1/3/4/5/134519878/zilarifesime.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/dwQ7mqo/boronobokot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/393482dc-3ba8-4cae-bc39-0b7b68bfff64/ti_nspire_cas_student_software_cracked.pdfIn PDF document text
    • http://bidilud.rf.gd/34174775845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5943b496-941a-4d40-a298-e66365e7b0b9/bivimikagegufosave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c546bbf4-624d-4e39-9be2-f51228afe011/99207440398.pdfIn PDF document text
    • http://vuvazapej.rf.gd/behringer_xenyx_2442fx_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f15e30-085d-4fd0-bf2c-d05662cdf274/fusukupoxanus.pdfIn PDF document text
    • http://mugofunuwutav.epizy.com/97325986839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df2f66d-900c-4212-8ad1-ad4d5e14914b/social_media_marketing_for_restaurants_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3114e8-4400-4be9-9d1a-06ef60ca5243/25192971720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba7953b-a0c8-4d50-abed-0d92e6e6b15b/bemabata.pdfIn PDF document text
    • http://bavajozobe.epizy.com/cv_template_designs_free.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_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 5252 bytes
SHA-256: cdfa263bb84b76915128bed2410b51de73c5396308f340e5ea941902a41061fe
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 9856 bytes
SHA-256: 2492f1daec1031273ad58189bedbe042c3f78c32ea695e518f1193a4318ad0a2