Malicious PDF — malware analysis report

Static analysis result for SHA-256 025b68ed65697f03…

MALICIOUS

PDF

87.1 KB Created: 2021-04-10 06:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8da47d3d8809d708bfb73c6f84ab8cde SHA-1: 7bee211adb890ec45dc4fe77fd912f8a2a2eeaa9 SHA-256: 025b68ed65697f03c2fbb589ea2de55d2d7b85095526baedfef4a483fb66165a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to disposable hosting domains, many of which are flagged as link farms. One prominent URL, 'https://resalured.ru/strik?utm_term=recoleccion+de+datos+cuantitativos+sampieri+resumen', is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=recoleccion+de+datos+cuantitativos+sampieri+resumen PDF link annotation
    • http://nubigawe.22web.org/98953510398.pdfIn PDF document text
    • http://recepty-dd.info/mitireforuvurzyll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_606d1ffa148ff.pdfIn PDF document text
    • http://detelibizonibi.22web.org/52319268151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5fda487982847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_60501ab15dbea.pdfIn PDF document text
    • http://sujatafuluwariv.22web.org/noun_pronoun_adjective_adverb.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/ammoniaksynthese_basf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_6051b830c8d1d.pdfIn PDF document text
    • http://fojedera.22web.org/82686910451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_606e7f8dc5944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60285acf1817c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421939/normal_5fced9372c47a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447095/normal_604496fb9f191.pdfIn PDF document text
    • http://vsspb.ru/vakofironabitefepudunvqbsw.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/76013778542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadiken.rf.gd/mountain_bike_size_guide_wheels.pdfIn PDF document text
    • http://nafezot.epizy.com/80952892960.pdfIn PDF document text
    • http://sexikiti.epizy.com/brushless_synchronous_generator.pdfIn PDF document text
    • http://golilamim.epizy.com/kefizugukedivesiso.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://recolecciondedatos-andreayraul.blogspot.comIn 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_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 5284 bytes
SHA-256: 4bf551409b1ca6ed79e59c89730d0aa75aba419ae139099b6e3b956f94b18ca1
font_01_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 11692 bytes
SHA-256: 977bd6a3d276057cb6744bd8bdaa0366a54206c7329571560fd4435a0c081d8a

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